filter_range.js function isInRange(val) { return val >= this.lower && val <= this.upper; } let range = { lower: 1, upper: 10 }; let data = [-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; let res = data.filter(isInRange, range); console.log(res);...
IE不兼容解决办法:写个共用方法, Array.prototype.myfilter = function(fun/*, thisp*/){varlen =this.length;if(typeoffun !="function"){thrownewTypeError(); }varres =newArray();varthisp = arguments[1];for(vari =0; i < len; i++){if(iinthis){varval =this[i];//in case fun mutat...
以下示例说明了 contextObject 参数的使用,该参数指定可以在 callback() 函数中使用 this 关键字引用的对象。 functionisInRange(value){if(typeofvalue !=='number') {returnfalse;}returnvalue >=this.lower && value <=this.upper...
尝试用filter()筛选出素数: 1 'use strict';23functionget_primes(arr) {4vari;5return arr.filter(function(element) {6var flag=true;7if(element<2){8 flag=false;9 }else{10for(var i=2;i<element;i++){11if (element%i==0){12 flag=false;13break;14}15}16}17returnflag;18});19}2021/...
[1, 2, 3, 4, 5, 6];const evenNumbers = numbers.filter(function (num) {return num % 2 === 0;});console.log(evenNumbers); // 输出: [2, 4, 6] 过滤长度大于等于3的字符串: const words = ["apple", "banana", "kiwi", "grape"];const longWords = words.filter(function (word)...
给你个自写的filter:function filter(obj, func) { let ret ...
country and #s = :status", FilterExpression: "Id IN (:e)", ExpressionAttributeValues: { ":country ": "USA", ":status": 1, ":e": "1" }, ExpressionAttributeNames: {"#s": "Status"} }; //get users dynamodb.query(params, function (err, data) { if (err) //error else { /...
// our list of ingredients in an array const ingredients = ['wine', 'tomato', 'onion', 'mushroom'] // a cooking function const cook = (ingredient) => { return `cooked ${ingredient}` ...
// our list of ingredients in an arrayconstingredients=['wine','tomato','onion','mushroom']// a cooking functionconstcook=(ingredient)=>{return`cooked${ingredient}`} 如果我们想要把这些作料做成一个调味汁(开玩笑的),用 reduce() 来归约!
// 参数是函数名functioncheck(arg){returnarg>10;}varbool=ages.some(check)// 参数是闭包函数// index、arr 分别为数组索引、数组数据varbool=ages.some(function(item,index,arr){returnitem>10;})console.log(bool) 2. filter() 过滤掉数组中不满足指定条件的值 ...