lodash debounce

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

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(‘

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

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

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

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

subsequent processing at a certain frequency. There are two solutions to debounce and throttle in response to both of these requirements. Throttle and Debounce are two solutions to the mismatch between request and response speed. The difference lies in the choice of different strategies. Throttle performs functions at equal intervals. Debounce time interval T

JS's function throttling and throttle and debounce detailed:Also realizes a function, may have the high efficiency, some efficiency is low, this phenomenon in the high energy dissipation execution process distinguishes is more obvious.A more common way to improve performance in this section, often called "function throttling," is described in code examples below.I. What is a function throttle:In the actual coding, MouseMove and resize are very frequen

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

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

Throttle The throttle here refers to the function throttling. In other words, the frequency controller of function calls is the continuous execution interval control. Main application scenarios include: 1. Move the mouse and move the mousemove event2. DOM element dynamic positioning, window object resize and scroll events Someone uses the above-mentioned event image as a machine gun scan. throttle is the trigger of the machine gun. If you don't trigger the trigger, it will always scan. The same

ThrottleThe throttle we're talking about here is the meaning of function throttling. Another popular point is the frequency controller of the function call, which is the continuous execution time interval control. The main application scenarios are as follows:1. Mouse movement, MouseMove eventDynamic positioning of 2.DOM elements, resize and scroll events for window objectsSome image of the image of the event described above as a machine gun fire, throttle is the trigger of machine guns, you do

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

Throttle What we are talking about here is the meaning of function throttling throttle. And the popular point is that the function calls the frequency controller, is the continuous execution time interval control. The main application of the scene such as: 1. Mouse movement, MouseMove events2.DOM element dynamic Positioning, Window object resize and scroll events Some people image of the incident as described above as a machine gun fire, throttle is the trigger of a machine gun, you do not pu

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

= _.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 ());

ArticleDirectory Debounce header execution Debounce tail execution Execute the throttle header and synchronize the version Complete throttle tail Debounce An image is a rubber ball. If you hold down the rubber ball with your fingers, the ball will remain stressed and cannot rebound until it is released. The focus of

First, prefaceThe following scenarios are often triggered by frequent events, so frequent DOM operations, resource loading, and other heavy behaviors can cause UI pauses and even browser crashes.1. Resize, scroll events for window objects2. MouseMove event when dragging3. MouseDown, KeyDown events in shooting games4. Text input, auto-complete KeyUp eventIn fact, for the Resize event of window, most of the actual demand is to stop changing the size of n milliseconds after the subsequent processin