Sets vs objects The main difference between the object (map, associative array), is that the Set is directly iterable. Which means it has a.forEachmethod, you can spread it into an Array (amongst other things). Set is easier to convert from/to a list because they’re both iterable. An...
dataArr= arrOfObj.map(item =>{return[item.name, item]; });//creates array of arrayvarmaparr =newMap(dataArr);//create key value pair from array of arrayvarresult = [...maparr.values()];//converting back to array from mapobjectconsole.log(result);//[{"name":"abc","age":27},...
第一反应是 new Set(Array) 去重,但是没有改变原数组,不符合题意(之后需要研究Set()是否修改原数组); 所以改用map加for; 但是还是没有遵从题意中的【不使用额外空间】,所以运行耗时400ms+ varremoveDuplicates =function(nums) { nums.map((item,index)=>{for(let i = 0; i < nums.length; i++){if...
const { Suite } = require('benchmark'); const removeDuplicates1 = require('../src/0026-Remove Duplicates from Sorted Array/removeDuplicates1'); const removeDuplicates2 = require('../src/0026-Remove Duplicates from Sorted Array/removeDuplicates2'); const testArr = [...Array(1e5)].map(() ...
remove Function When called, removes the listener from the event. Example view.on("click", function(event){ // event is the event handle returned after the event fires. console.log(event.mapPoint); }); place Method place(geometry) Allows creation of a graphic similar to create with ...
}函数式编程map-reduce: function sum(arr) { return arr.reduce(function(prev, curr, idx, arr){ return prev + curr; }); } forEach遍历: function sum(arr) { var s = 0; arr.forEach(function(e) { s += e; }) return s; }; ...
n:t)},remove:function(e,t){var n,r=e[this.expando];if(void 0!==r){if(void 0!==t){n=(t=Array.isArray(t)?t.map(X):(t=X(t))in r?[t]:t.match(P)||[]).length;while(n--)delete r[t[n]]}(void 0===t||S.isEmptyObject(r))&&(e.nodeType?e[this.expando]=void ...
牛客网的45道JS能力评测题个人觉得是非常好的45道js基础检测题,基本就是对自己的JavaScript基础做一个比较全面的评估,包括if语句、循环体、基础操作符、setInterval、setTimeout、流程控制、常用数组方法及es6相关(解构、Map、Set、...等)。之前我已经做过一遍了,我记得以前牛客网不支持es6的写法,这两天花了点时间...
remove useless replace() -const a = 'hello'.replace(world, world); +const a = 'hello';remove useless new(why) -new Error('something when wrong'); +Error('something when wrong');add missing new -const map = Map(); +const map = new Map();...
.dehyphenate()- remove hyphens between words, and set whitespace .toQuotations()- add quotation marks around these matches .toParentheses()- add brackets around these matches Loops .map(fn)- run each phrase through a function, and create a new document ...