lodash vs ramda

Lodash chain, lodash chain Chain Var _ = require ('lodash '); var user1 = {name: 'hangsan', height: 180, weight: 120}; var user2 = {name: 'lisi ', height: 180, weight: 130}; var user3 = {name: 'hangsan', height: 180, weight: 131}; var users = [user1, user2, user3]; var result = _. chain (users ). filter ({name: 'hangsan '}). uniq ('name '). pluck ('weight '). v

that as well.Ramda.js: The primary distinguishing features of RAMDA are: Ramda emphasizes a purer functional Style. Immutability and Side-effect free functions is at the heart of its design philosophy. This can help you get the job to do with simple, elegant code. Ramda functions is automatically curried. This allows-easily build

of LAMDA expression that is informally said You cannot assign a variable to an implicit type If the purpose is outside the LAMDA expression, C # does not allow the use of a jump statement (Break,continue,goto) inside an anonymous function * External variables: External declarations of LAMDA expressions (including parameters), but local variables for internal snapping (access) of LAMDA expressions are called external variables. This is also an external variable.int Comparisoncount=

Are you still worrying about converting, matching, and finding data in JavaScript? A bunch of seemingly simple foreach, but long boring, but still keep repeat it! Perhaps you have already used underscore.js, good, you have progressed very big step. But today I want you to take a step further and replace underscore with Lodash.Lodash started as a fork in the Underscore.js library because of disagreement with other contributors (underscore.js). John-david Dalton's initial goal was to provide more

Brief introductionLodash is a library of JavaScript tools with consistent interface, modularity, and high performance features. Provides a large number of tool functions, and for this reason, makes Lodash a library that is the most dependent on other libraries in the NPM package library.Just as jquery adds global $ before all functions, Lodash uses global _ to provide quick access to tools.varrequire(‘

want to try the functional style of the basic JS library, it is recommended to use LODASH/FP this module. We all know that Lodash is underscore better implemention, and LODASH/FP is the lodash of the branch. Unlike simple currying, for ease of use, LODASH/FP's designers swa

https://lodash.com/Direct hit scene Are you still worrying about converting, matching, and finding data in JavaScript? A bunch of seemingly simple foreach, but long boring, but still keep repeat it! Perhaps you have already used underscore.js, good, you have progressed very big step. But today I want you to take a step further and replace underscore with Lodash. Lodash started as a fork in the Undersc

Lodash is used to manipulate objects and collections, with more functionality and better performance than underscore.Official website: https://lodash.com/Reference: Installation: NPM Install LodashFirst install Lodash via NPM:NPM I--save LodashReference Lodash in the JS file:var _ = require (' Lodash ');Traverse"ForEac

Objective One of the reasons for Lodash's popularity is its excellent computational performance. And its performance can have so outstanding performance, much of it is derived from its use of the algorithm-lazy evaluation.This article will describe the principle and implementation of lazy evaluation in Lodash source code.An analysis of the principle of inertia evaluation Lazy Evaluation (lazy Evaluation), also known as lazy computing, lazy evalu

Objective: Lodash (i) just studied the various methods in the array, followed by the frequently used loop traversal problem Process: 1._.forEach(collection, [iteratee=_.identity], [thisArg]) 遍历 _.foreach ([22,33,11,55],function (value) {// If a parameter is returned is its value console.log (value) ; // the }); _.foreach ([22,33,11,55],function (value,index) {// = This is the first

preceding value assign ({}, {a:1}, {b: {c:2, D:3}})//{a:1, B: {C:2 , D:3}} assign ({}, {a:1}, {b: {c:2, D:3}}, {b: {e:4}})//{a:1, B: {e:4}}//' Assign ' function ignores the genus on the prototype chain Of function Foo () {this.c = 3;} FOO.PROTOTYPE.D = 4; Assign ({a:1}, new Foo ()); {a:1, C:3}//' Assign ' will modify the original object var test = {A:1}; Assign (test, {b:2}); {a:1, b:2} console.log (test); {a:1, b:2} extend (object, [sources]) In the 3.x version, Extend is an alias f

Summary of common JavaScript lodash usage series, javascriptlodash Lodash was originally a fork of the Underscore. js library, because it was different from other contributors (Underscore. js. John-David Dalton's initial goal was to provide more "consistent cross-browser behavior ......, And improve performance ". Later, the project achieved greater results on the basis of the existing success, and released

1 _.compact usage _.compact ([0, 1, False, 2, ', 3, ' mm ']);var test = _. Compact([ -1,0, 1, False, 2, ', 3, ' JJ ']); Console.log (test);----1,1,2,3,jj//output 2_.different usagevar test = _.difference ([1, 2, 3, 4, 5], [5, 2, ten]); Console.log (test); 1,3,4//output Results 3_.find usagevar characters = [ {' name ': ' Barney ', ' age ': $, ' blocked ': false}, {' name ': ' Fred ', ' age ': +, ' Blocke d ': true}, {' name ': ' Pebbles ', ' age ': 1, ' blocked ': false}];_.find

Lodash common method 2 -- modify, lodash2 -- modify 1. map Function timesThree (n) {return n * 3;} _. map ([1, 2], timesThree); // => [3, 6] 2. remove Remove ArrayArrayMeetingPredicateReturns the array of elements to be removed. Var array = [1, 2, 3, 4]; var evens = _. remove (array, function (n) {return n % 2 = 0 ;}); console. log (array); // => [1, 3] console. log (evens); // => [2, 4] 3. uniq Unique _. Uniq ([2, 1, 2]); // => [2, 1] //

1 _.set (object, path, value)2 # ? ? ?3 4 sets the property value on the path of the object. If the path does not exist, create it.5 6 Parameters7 1. Object: objects to be enlarged.8 2. Path (array|string): Property path.9 3, Value (*): The value that needs to be set.Ten return value One (object): Returns an object. A - Example - var object = {' A ': [{' B ': {' C ': 3}}]}; the - _.set (object, ' A[0].B.C ', 4); - Console.log (OBJECT.A[0].B.C); - //= 4 + - _.set (object, ' x[0].y.z ', 5); + C

HTML>Head> MetaCharSet= "UTF-8"> title>Templatetitle> Scriptsrc= "Lodash.js">Script>Head>Body> Script> varStr= 'the card is d'. Replace (/[\s]+/G,"'). Replace (//, function(Exprs, path) {returnexprs.replace (Path,function(expr) {varret= '(function () {var fns= (\ ')'+Expr+'\ '). Split ("|"); var data= fns.shift ();'; /*ret + = ' Fns.foreach (function (FN) {' + ' var fninfo = Fn.split (":"); ' + ' data = fninfo[0] (data, fninfo[1]) ' + '};*/ret+= 'return _filter ('+Expr.split ('|')

The property of access in Javascript can is problematic-especially when dealing with nested Objects and Arrays. Doing it manually and in a safe manner requires tons of boilerplate inside conditionals and results in a defensive style O F Coding. In this lesson we ' problem how to overcome it using the method from the get popular utility L IbraryLodashvar data = { " Response": {"Body" : {"Devicedetail" : { "Devicedetails": [ { "Handsetimei": 7356383,

= _.keyBy(foo, ‘name‘)//bar = {// aaa: {id: 0, name: "aaa", age: 33},// bbb: {id: 1, name: "bbb", age: 25}//}_.filterFilters out eligible elements based on conditions, returns a new arrayvar foo = var foo = [ {id: 0, name: "aaa", age: 33}, {id: 1, name: "bbb", age: 25}]var bar = _.filter(foo, [‘name‘, "aaa"])//bar = {// aaa: {id: 0, name: "aaa", age: 33}//}_.mapPick a key from the collection and return its value as an arrayvar foo = var foo = [ {id: 0, name: "aaa", age: 33}, {id: 1, name:

var Data=[{value:1200,count:5},{value:1200,count:10},{value:1230,count:5},{value:1240,count:5}];console.log (_. Chain (data) . GroupBy ("value") . Map (function (value, key) { return [key, _.reduce (value, function (result, Currentobject) { return { value:currentObject.value, count:result.count+ currentobject.count } }, { value:0, count:0 }]; }) . Object () . Value ());

these days and learned a lot of the original knowledge, in the weekend summed up some JavaScript library-lodash (Array) of the content, I hope in the future learning from time to review and update themselves. The lodash-JavaScript Tool Library is very popular today, and here is a summary of some of the code I have for it :1._.chunk refers to the element that merges an array by the specified length . _.chu