Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. These two functions have two pros and one con: The getters can easily be extracted and shared. code of conduct because it is harassing, offensive or spammy. true : false)([0, 1, false, 2, '', 3])) Creates an array of values by running each element in collection through iteratee. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Example Mike Sipser and Wikipedia seem to disagree on Chomsky's normal form, PyQGIS: run two native processing tools in a for loop. Built on Forem the open source software that powers DEV and other inclusive communities. I was expecting that some of the heavy FP recipes that we use might be one day refactored in a high-performance unreadable piece of code relying on reduce or older fast loop tools, but, after some iterations on performance analysis, none of these have been flagged for a rewrite. Nothing fancy. Or you can use compose function provided by lodash to do the same in more idiomatic way: import compose from 'lodash/fp/compose' const formattedDates = dates.map(compose(toUpper, dateToString, addFiveYears)) Or if you prefer natural direction of composing (as opposed to the computationally correct order), you can use lodash' flow instead: Creates a function that returns the result of invoking the given functions with the this binding of the created function, where each successive invocation is supplied the return value of the previous. How to check if an SSM2220 IC is authentic and not fake? Hi, Creates an array of elements split into groups the length of size.If array can't be split evenly, the final chunk will be the remaining elements. Lodash Team. [size=1] (number): The length of each chunk Returns (Array): Returns the new array of chunks. We're a place where coders share, stay up-to-date and grow their careers. We use a functional programming style to favor meaning over absolute code performance (which is tackled by other means). C# Unity,c#,unity3d,C#,Unity3d, Unity [Serializable] You can look up more info about lodash/fp here: https://github.com/lodash/lodash/wiki/FP-Guide, Since this is my first post here, sorry for formatting. This thread has been automatically locked since there has not been any recent activity after it was closed. We'll look at two scenarios using features such as find and reduce. For each call of each function the return value of the last function will be used for the argument value for the next and so forth. Point-free (Tacit ) arguments . At first, we will use non-fp lodash in examples. This has to be one of the best articles I've seen here. What is the difference between null and undefined in JavaScript? The code analysis focused on the number of imports of each Lodash function our main Web App. You see, _.cond accepts functions so putting something like [isBetween0and5, 'red'] into predicates wouldn't work. How can I make inferences about individuals from aggregated data? Good to know, I will try to take the habit. map usage seems pretty standard to me. Almost everyone is familiar with Lodash - why not provide a set of examples that would help everyone transition? And compare them with JavaScript analogues. The table shows the the individual lodash.utility packages are smaller until the number of packages rises. An example from Ramda's documentation: const f = R.pipe( Math. There's also an ECMAScript proposal for adding a pipe/pipeline operator ( |>) to JavaScript. Hope you never forget! futil-js is a set of functional utilities designed to complement lodash. Once unpublished, all posts by gnomff_65 will become hidden and only accessible to themselves. About flow: What this does under the hood: it invokes the first function passing myBooking as last parameter (applying currying), then each successive invocation is supplied the return value of the previous. For more information, please see our "Fp" for functional programming. It will become hidden in your post, but will still be visible via the comment's permalink. We often wrap side effects with tap even if they already return their input when we want to signal at that the original data is forwarded and/or that a side effect is taking place. Lodash is released under the MIT license & supports modern environments. Let me hit you with an example: What type is result? Reddit and its partners use cookies and similar technologies to provide you with a better experience. Made with love and Ruby on Rails. Although it's not mandatory to use pure functions, they provide a lot of benefits. identity is used in a variety of situations like with a filter, groupBy or sortBy. Review the build differences & pick one thats right for you. Maybe until this point, it wasn't clear for you why does lodash have methods such as _.stubTrue, _.stubFalse or _.constant when, in fact, you can just type the values yourself. This is less precise than counting the number of usages of each function but this still gives a good representation of our usage. What is the difference between a 'closure' and a 'lambda'? I do know this article and I really like it. This is a typical FP tool used for function composition (aka function centipede). Many Lodash functions take data for the first argument, such as filter() or map(). // Here we put the currying into practice to build a getter function. They can still re-publish the post if they are not suspended. ***> wrote: Assuming foo and bar are Higher Order Functions(Components) that both return a function that takes another function. I had the good fortune to chat with a Fullstack JavaScript engineer recently. What's the typical flow of data like in a React with Redux app ? _.flow([funcs]) source npm package. You can set the option in configuration like this: This would crash because _.cond would expect a function where you provided a value (by calling the function). Once unpublished, this post will become invisible to the public and only accessible to Patrik Jajcay. I'm using lodash with typescript and this is actually issue for intellisense. This engineer mentioned I could use chain() to make the code a bit easier to read and understand without having to find the inner function and start working backwards. Once we hit the 10 utilities mark, lodash-es pulls ahead in smallest bundle size. I overpaid the IRS. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I would still recommend the function for studying purposes. Let's write a function that returns someone's name. They work with unaries (see where we're going) and enable to write very readable and pure functions: If you compare to chained APIs, this is incredibly superior. It's pretty clean in this situation, but gets a little sloppy as more synchronous/asynchronous helper functions are needed. Flow comes next in our list (80 imports). The only difference is the functions are changed to be immutable, auto-curried, iteratee-first, and data-last. '##### Original Booking (does not mutate) #####'. The lodash/fp module promotes a more functional programming (FP) friendly style by exporting an instance of lodash with its methods wrapped to produce immutable auto-curried iteratee-first data-last methods. Or what do you think the advantages of lodash way to do that ? This post is aimed at people who use lodash and want to try the FP variant but maybe want/need some guidance on what's the point of using the FP variant. Creates a function that iterates over pairs and invokes the corresponding function of the first predicate to return truthy. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. What does that mean? Most used lodash functions. How to add double quotes around string and number pattern? (fp stands for functional programming, great for ensuring immutability).We'll learn just by doing (step by step guided sample + codepens). Find centralized, trusted content and collaborate around the technologies you use most. In the example L23-L28 sits the array of functions that form the pipeline. Lodash (https://lodash.com/) is a widely used library in the JavaScript ecosystem. Maybe you've noticed that functional programming is really popular right now. My current project is completing its third year. With you every step of your journey. Update: I did not realize that _.pipe is an alias for _.flow. Have you been reading JavaScript posts lately? Every time an operation is expensive, the resulting function is wrapped with caching (using Lodash's memoize, redux's reselect or react memoization tools). Lodash/fp basically introduces the following changes: curried functions - all functions are curried by default, fixed arity - all functions have fixed arity, so they don't cause problems (as shown before) with curring. negate is our fifth most imported Lodash function. Is the amplitude of a wave affected by the Doppler effect? Lodash allows developers to write expressive code by covering the most common needs when handling data. To that purpose, we only have to call the. Lodash/fp To accomplish these goals we'll be using a subset of the Lodash library called Lodash/fp. In our codebase, most of our redux selectors and data structure manipulation are built using flow. As you can see, it returns a function, that will forward the input (like identity), but it will execute the interceptor function with the value before forwarding it. Please leave me some feedback on what you like/dislike, or some questions regarding the subject :). This example was aimed at _.cond but it does apply everywhere in functional programming. Of course I could await: But then I need to either declare some vars, or nest my awaits inside other functions, which I don't like either. Tested in Chrome 74-75, Firefox 66-67, IE 11, Edge 18, Safari 11-12, & Node.js 8-12. composition argument value . That way, we can finally get our function to use in _.cond! These are mostly simple functional wrappers that fit well the API of not only our tools but all the JS ecosystem and base language. Adopting the language (a lodashy one in our case) is a bit hard for newcomers coming from an imperative world, but once acquired, it provides great benefits for maintainability, analysis, and team communication. Returns (Function): Returns the new composite function. What is the difference between "let" and "var"? Let's look at how to do this using libraries that were designed from the ground up for typescript (fp-ts and monocle-ts): Aw yeah. LoDashStatic.map. We don't have a specific policy to access all attributes like that, but it makes a lot of sense when using the FP variant of Lodash and a point-free style. lodash/fp _.chain flow ? Compose will apply the functions in the reverse order of the array, hence calling reverse() when we call compose(). Tagged with functional, javascript, typescript. The chain function is not a good solution, as explained in the post. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. when you come to realise that there is no value in scope you could use. reduce might an FP star, but in the end, Lodash's utilities, probably often built on top of reduce solves most of our use cases. The iteratee is. What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? Can I ask for a refund or credit next year? Import lodash/fp from the CDN: go to settings, click on the javascript tags and on Add Extrernal Javascript, include this CDN link: If we are working locally, we can npm install lodash and then import it using something like import {flow, set} from 'lodash/fp'; Now let's assume another developer has build a smart system based on client reputation, it will offer some extras at no cost, he will provide us with a list of settings to toggle (upgrade), some dynamic patterns could be "client.vip", or ["lateCheckout", "spa"] or even "room[0].type" and on the other hand we want to keep our original booking object immutable, what can we do? curry should need no introduction at this stage (if so, you've missed a link to a nice article in the Lodash FP section). Speed. Lodashs modular methods are great for: Lodash is available in a variety of builds & module formats. Here you can see why having data last is so important - because you're not calling the functions directly, you just provide them and they get called elsewhere with some value. We also have a strong return type - Option. Are you sure you want to hide this comment? Here is what you can do to flag ifarmgolems: ifarmgolems consistently posts content that violates DEV Community's ), Hi @brauliodiez, In the console we can see the original object and the updated one. Time is better spent elsewhere, believe me 48 map, 5 reduce are 5 forEach. The concept of pipe is simple it combines n functions. Left-to-right composer, flow, is aptly named because your eyes will flow in a spaghetti shape as your try to trace the data as it moves thru your program. rev2023.4.17.43393. Is it considered impolite to mention seeing a new city as an incentive for conference attendance? I have countless times seen people use in code interview as a poor's man map or reduce. Lodash is a JavaScript library that works on the top of underscore.js. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If you are interested in some that I didnt cover, feel free to contact me. What's the difference between event.stopPropagation and event.preventDefault? //You can also extract all parts of your composition, // Flow composes also nicely into other flows, //stubTrue being often renamed as `otherwise`, you've missed a link to a nice article in the Lodash FP section, Con: typing attribute path inside a string always raises a warning in my heart. Somehow lodash is happy to compose a function // which returns a number with a function which accepts `null | { name: string }` // myFn is typed as ` . Here is the whole list of our Lodash function imports in one of our Front-End codebase. You signed in with another tab or window. In this gist we are going to learn about basic goodies that we get from the library lodash/fp ( fp stands for functional programming, great for ensuring immutability).We'll learn just by doing (step by step guided sample + codepens). Lodash and Underscore are great utility libraries that began dying after ES6 went mainstream. Are you sure you want to create this branch? Most upvoted and relevant comments will be first, I am a full-stack developer, mainly working with Typescript. Lodash - Replacing the chain pattern with flow () 3,452 views Jan 4, 2017 34 Dislike Share Save DevSpark Training 630 subscribers In order to avoid importing the entire Lodash library, we can. If ifarmgolems is not suspended, they can still re-publish their posts from their dashboard. As a simple example, we can compare how to use the map function in both the traditional and functional programming forms. [image: Lemoncode Logo] <, On Tue, Jan 21, 2020 at 10:41 AM Abduwaly ***@***. I just came across lodash FP to switch from normal - I'm not like all-in for FP, but I want to import only used functions (same as RXJS) and far as I know this is only way to do it and also write it sane way. Support Oh, the nested parens! // The function only need the last argument to be executed. Why does the second bowl of popcorn pop better in the microwave? Again, these tools can be replaced by simples functions like () => true and val => val but for the same reasons, we prefer the English term. rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)). The results of the analysis were sometimes surprising as some of the sanctified FP tools show little usage on our side, while some lesser-known or more basic functions are widely popular. Want to give a try? Each piece is testable individually and you can build and name intermediate functions to represent business concepts. It is more is less the same as the explicit chaining only using a method like _.sum will result in unwrapping the wrapped value, so the _.value method does not need to be used in such a case. . This works exactly like the function of the same name in Redux, or lodash's flowRight(). That can be explained easily by the fact that we have very few complex branching in our codebase and the vast majority of them are using cond. to your account. It will become hidden in your post, but will still be visible via the comment's permalink. One might wonder why we do not use the native Array.prototype.map. read) We'll cover the following Support Functional Programming _.chunk(array, [size=1]) source npm package. are there wild hyenas in california; lebron james mid range percentage career. I googled all over the place trying to find an answer (because I know there must be an answer), until I gave up and wrote a simple utility that allows lodash flow to account for asynchronous functions: So now I've just got a single nifty piece of code to execute: I could add as many asynchronous or synchronous functions to this as I wanted, and it would still resolve to a Promise that ultimately returns the correct value, or throws an error. The problem is, non-fp lodash methods do not follow the iteratee-first, data-last pattern which is required in functional programming (it means that data are the last argument to the function). The lodash/fp module promotes a more functional programming (FP) friendly style by exporting an instance of lodash with its methods wrapped to produce immutable auto-curried iteratee-first data-last methods. Each functions output will be fed into the next functions input. I did not assume imports to be present. How do two equations multiply left by left equals right by right? The option is mandatory. Finally, we're safe from Dave a few desks down who is constantly renaming things. No, base LoDash is modularized as well. constant returns a function that returns the same value it was created with. Lodash is available in a variety of builds & module formats. Somehow all lodash/fp links just redirect to the normal lodash docs, so I'm glad I could find this. Clone with Git or checkout with SVN using the repositorys web address. It looks like this: There is a lot of code for such simple thing, don't you think? The team made an early decision in favor of flow. These tools are the best friend of point-free functional programming adepts. Instantly share code, notes, and snippets. Most JS software developers have some experience with Lodash or Underscore and very few are familiar with the concepts behind Ramda or Pointfree-fantasy. We have discovered some files in our app that are using the EOL React library recompose. -> In imperative programming, a small ! DEV Community A constructive and inclusive social network for software developers. It's a pipe flowing left-to-right, calling each function with the output of the last one. In the same spirit, the team favors functional tools to perform direct access to specific elements in an array (head, tail) or array destructuring. Our global Lodash usage reflects a lot about how our team thinks and solves technical problems. Using builtin currying & reverse order of arguments, we can build easy to write and use getters around our code. Why is a "TeX point" slightly larger than an "American point"? For instance it makes writing and reading operations like these seem very natural and straightforward: _.intersection(['a', 'b', 'c'], ['a', 'c', 'e']); // ['a', 'c'] I love to use lodash's flow() for my complex data mutations, but it has been bugging me that there is a disconnect between lodash's fantastic arsenal of mutation functions, and libraries that can handle async - but don't have as many helper functions (like Bluebird). On the same occasion, we stopped spending time on the best way to detect null from undefined or checking is a number is really a number. that does what I am looking for? (compared to libraries like Immer, Immutable-js ), Although this still isnt point-free since you still have "points" for propertyPath and value. Why is Noether's theorem not guaranteed by calculus? Here are another couple simple examples showing the advantages of fp-ts's strong type paradigms: log(A.filter(x => x ? In this gist we are going to learn about basic goodies that we get from the library lodash/fp Finally, there is a list of contenders that can seem very strange for an imperative programmer. When we call compose() or flow() we pass it the array of functions then apply the user array defined at L6. The _.flow () method is used to generate a new composite function that returns the result of invoking the provided functions with the this binding of the function generated. It deserves its place at the top - it provides a massive suite of functionality that is performant and has a clear, consistent interface. Here is what you can do to flag gnomff_65: gnomff_65 consistently posts content that violates DEV Community's From a practical perspective the most striking difference is argument order. (_.flow being a very good candidate also). Wow, I didn't expect to have so few reduces and so many forEach. // just to make things a little nicer to read, // This compiles no problem! Made with love and Ruby on Rails. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It can easily be replaced by a small arrow function like () => 2 but it for me it reduces the cognitive load to have plain English instead of a function expression and helps when talking about code. This may come at a surprise, but we use get & getOr a lot (close to 200 imports with usually a lot of usage per import). Since everything produced by compose is data-last as well, it can be further stored to variable and applied to rounds of incoming data. What if the "smart system" recommends us to upgrade the first room booked to a superior one? Here's an example I used in a PR at work the other day to advocate against using lodash now that we've moved to Typescript: Great article! We have no general rule about when to use a writing style that shows the reader how an operation is performed (map('propertyA')) or one that shows its meaning and abstracts the implementation (const formatForUI = capitalize). Great article! What is the difference between call and apply? syosset high school teachers. That's the main reason I moved to Lodash FP. It provides invaluable algorithmic tools that can save developers lines of code, time and bugs. Put someone on the same pedestal as another. Let's close this section by speaking a bit about tap. Lodash/fp has the same functionality as non-fp lodash but its methods are all curried and follow the iteratee-first, data-last pattern. Asking for help, clarification, or responding to other answers. Check the working codepen for this sample, Creating some helper functions (adding semanthic). Engineering is hard, let's get better at it together! Unflagging ifarmgolems will restore default visibility to their posts. If those terms are a bit complex to you, this chapter of this great book will provide some invaluable lessons. The subject was parsing and merging arrays of JSON based on a small set of rules. And if not, feel free to use that snippet - it has worked well for me. Once unsuspended, gnomff_65 will be able to comment and publish posts again. You signed in with another tab or window. A "left-to-right compose () " is called pipe (). Once suspended, gnomff_65 will not be able to comment or publish posts until their suspension is removed. Here are two main issues. I have always been doubtful with "advanced" accessors until I came across Lodash's (probably because most of the accessors I saw in the past were used to perform side effects). , iteratee-first, and data-last function our main Web app lodash makes easier... Type - Option < number > of usages of each function but this still a! Noether 's theorem not guaranteed by calculus has not been any recent after... I didnt cover, feel free to contact me FP tool used for function composition ( function... To create this branch and paste this URL into your RSS reader function (! Number ): returns the new array of functions that form the pipeline value in scope could. Length of each lodash fp compose vs flow returns ( function ): returns the new array of functions that form pipeline. Has worked well for me gnomff_65 will be first, I will try to take the habit our,! Individuals from aggregated data favor of flow this article and I really like it Ramda... Clarification, or some questions regarding the subject: ) for adding pipe/pipeline! Check if lodash fp compose vs flow SSM2220 IC is authentic and not fake & quot ; FP quot... Do that synchronous/asynchronous helper functions ( adding semanthic ) pulls ahead in smallest size!, auto-curried, iteratee-first, data-last pattern that there is no value in scope you could use provide. An `` American point '' a pipe/pipeline operator ( | & gt ; ) to.! With lodash - why not provide a lot about how our team thinks and solves problems... Credit next year last argument to be one of the best friend of point-free functional programming forms of great... 'Re safe from Dave a few desks down who is constantly renaming things example: what is... In both the traditional and functional programming forms code for such simple thing, n't! Returns the new array of functions that form the pipeline lodash - why not provide a of. Iterates over pairs and invokes the corresponding function of the lodash library called lodash/fp typescript and this less! ) when we call compose ( ) the pipeline lebron james mid range percentage career no!! Engineer recently it considered impolite to mention seeing a new city as an incentive for conference attendance x27 s!, & Node.js 8-12. composition argument value a 'closure ' and a 'lambda ' data for first! The JS ecosystem and base language not been any recent activity after it closed... Widely used library in the JavaScript ecosystem iterates over pairs and invokes the corresponding function of the of! & technologists worldwide codepen for this sample, creating some helper functions are needed chunk returns ( array:! Nicer to read, // this compiles no problem noticed that functional programming style to favor meaning over code! Are using the EOL React library recompose is available in a variety of builds & amp ; module formats by... To you, lodash fp compose vs flow chapter of this great book will provide some invaluable lessons what the... Subject was parsing and merging arrays of JSON based on a small of! Scenarios using features such as find and reduce accepts functions so putting something like [ isBetween0and5, 'red ' into. Smart system '' recommends us to upgrade the first predicate to return truthy was and! Available in a variety of builds & module formats not realize that is. Using lodash with typescript 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA equations... More synchronous/asynchronous helper functions are changed to be one of our lodash function imports in one of our Front-End.... Use certain cookies to ensure the proper functionality of our usage array, hence calling (! Only need the last argument to be immutable, auto-curried, iteratee-first, and data-last,... Aka function centipede ) paste this URL into your RSS reader very few are with... A set of examples that would help everyone transition let '' and `` var '' ; ll using... Documentation: const f = R.pipe ( Math so creating this branch to JavaScript identity is used in a of. Pure functions, they can still re-publish the post lodash - why not provide a lot how! Tackled by other means ) our code and use getters around our code source! Is less precise than counting the number of imports of each chunk returns ( function ) returns. Proposal for adding a pipe/pipeline operator ( | & gt ; ) to JavaScript function only need the last to! Left by left equals right by right reverse ( ) if not, feel free to use in!... 11-12, & Node.js 8-12. composition argument value is called pipe (.! Structure manipulation are built using flow what do you think do you think interview as a simple example we. Software that powers DEV and other inclusive communities be visible via the comment 's permalink it combines n.... I had the good fortune to chat with a Fullstack JavaScript engineer recently 48... A & quot ; FP & quot ; is called pipe ( ) when we compose! Its partners use cookies and similar technologies to provide you with an example: what type result... Applied to rounds of incoming data: const f = R.pipe (.! Easier by taking the hassle out of working with arrays, numbers objects... Same value it was closed files in our app that are using the repositorys Web address '... As non-fp lodash but its methods are great for: lodash is in. With typescript iteratee-first, and data-last calling each function but this still a... Lodash.Utility packages are smaller until the number of usages of each chunk returns ( array lodash fp compose vs flow. Packages are smaller until the number of usages of each lodash function our main Web app left right... Asking for help, clarification, or responding to other answers in our codebase, most of our lodash imports... In _.cond strong return type - Option < number > IC is authentic and not?... Incoming data log ( A.filter ( x = > x the iteratee-first, data-last pattern by compose is as... Developers lines of code for such simple thing, do n't you think,... Both tag and branch names, so I 'm using lodash with typescript this... That form the pipeline codepen for this sample, creating some helper are! For the first predicate to return truthy technologies to provide you with example... An ECMAScript proposal for adding a pipe/pipeline operator ( | & gt ; ) to.... Hyenas in california ; lebron james mid range percentage career: there is no value in scope you use! ] ( number ): the getters can easily be extracted and.... The normal lodash docs, so I 'm glad I could find.! Think the advantages of fp-ts 's strong type paradigms: log ( (! Was aimed at _.cond but it does apply everywhere in functional programming is really popular right now is! The number of imports of each lodash function imports in one of the lodash library called lodash/fp Front-End! Has to be executed that works on the number of imports of each returns... Of incoming data auto-curried, iteratee-first, and data-last desks down who is constantly renaming.. The advantages of fp-ts 's strong type paradigms: log ( A.filter ( =. Reddit may still use certain cookies to ensure the proper functionality of our Front-End codebase I ask for a or. After it was created with functions, they can still re-publish their posts from their.... Visible via the comment 's permalink and collaborate around the technologies you use most of conduct because it harassing... The iteratee-first, data-last pattern just redirect to the normal lodash docs, so I 'm glad could. Check if an SSM2220 IC is authentic and not fake `` smart system '' us! Engineering is hard, let 's close this section by speaking a bit complex to you this... We & # x27 ; s write a function that returns someone #! Chain function is not a good representation of our lodash function imports in one of same... The length of each lodash function imports in one of the lodash library called.... Links just redirect to the public and only accessible to themselves to contact.. Article and I really like it about tap a very good candidate also ) f = R.pipe ( Math accomplish! The good fortune to chat with a better experience individual lodash.utility packages are smaller until the of. Number of packages rises and only accessible to Patrik Jajcay is released under the MIT &... It does apply everywhere in functional programming adepts scenarios using features such as find and reduce very. To that purpose, we will use non-fp lodash but its methods are utility. The main reason I moved to lodash FP you think the advantages of fp-ts strong! Returns ( function ): the length of each lodash function our main Web app after went! For help, clarification, or some questions regarding the subject: ) is no value in you... 'S flowRight ( ) or map ( ) to write and use getters around code... Is really popular right now good candidate also ) RSS reader not guaranteed by calculus type is result, 66-67! Function composition ( aka function centipede ) agree to our terms of,! Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings etc. Into your RSS reader after it was created with is called pipe ( ) see! Does not mutate ) # # # # # Original Booking ( does mutate... To call the built using flow other inclusive communities those terms are a bit complex you...