constnums = [10,20,30,111,222,333]letnewNums = nums.filter(function(n){returnn<100}) 示例:js中获取素数 functionget_primes(arr) {returnarr.filter(num=>{// 1不是素数if(num ===1) {returnfalse; }// 从2开始,取到该数的平方根即可for(vari=2; i<=Math.sqrt(num); i++) {// 如...
一.数组Array常用方法 1. 使用reduce const arr = [{ "code": "badge", "priceList": [{ "amount": 3000 }] }, { "code": "DigitalPhoto", "priceList": [{ "amount": 1990 }] } ] let arr2 = arr.reduce((pre, cur) => { pre[cur.code] = cur.priceList return pre }, {}) con...
数组推导是非标准的,并且它不可能添加到ECMAScript。考虑到以后,应该使用Array.prototype.map,Array.prototype.filter, 和arrow functions. 概述 数组推导式是一种新的 JavaScript 表达式语法,使用它,你可以在一个原有数组的基础上快速的构造出(推导出)一个新的数组。
jsCopy to Clipboard const numbers = [1, 2, 3, 4]; const filteredNumbers = numbers.map((num, index) => { if (index < 3) { return num; } }); // index 从 0 开始,因此 filterNumbers 为 1、2、3 和 undefined。 // filteredNumbers 是 [1, 2, 3, undefined] // numbers 依旧是 ...
Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on iOS Samsung Internet WebView Android WebView on iOS Deno Node.js filter Legend Tip: you can click/tap on a cell for more information. Full support Full support...
一.数组Array常用方法 1. 使用reduce const arr = [{ "code": "badge", "priceList": [{ "amount": 3000 }] }, { "code": "DigitalPhoto", "priceList": [{ "amount": 1990 }] } ] let arr2 = arr.reduce((pre, cur) => {
Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on iOS Samsung Internet WebView Android WebView on iOS Deno Node.js filter Legend Tip: you can click/tap on a cell for more information. Full support Full support...
#sec-array.prototype.filter desktopmobileserver Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on iOS Samsung Internet WebView Android WebView on iOS Deno Node.js filter Legend Tip: you can click/tap on a cell for more information. ...
{ 95 // If no search term has been entered, just make the finalGroup array equal to the categoryGroup 96 // array — we don't want to filter the products further — then run updateDisplay(). 97 if(searchTerm.value.trim() === '') { 98 finalGroup = categoryGroup; 99 update...
function map(f, a) { const result = new Array(a.length); for (let i = 0; i < a.length; i++) { result[i] = f(a[i]); } return result; } 在以下代码中,该函数接收由函数表达式定义的函数,并对作为第二个参数接收的数组的每个元素执行该函数: jsCopy to Clipboard function map(f,...