Array.prototype.mapA = function(fun /*, thisp*/) { var len = this.length; if (typeof fun != "function") throw new TypeError(); var res = new Array(len); var thisp = arguments[1]; for (var i = 0; i < len; i++) { if (i in this) res[i] = fun.cal
1.装箱和拆箱: 装箱:把基本数据类型转化为对应的引用数据类型的操作: var num = 123 // num var objNum = new Num(123) // object console.log(typeof objNum) // null 拆箱:将引用类型对象转换为对应的值类型数据对象: valueOf() var objNum = new Number(132) console.log(typeod objNum.valueOf()) // 123 number js toPr
11991 - Easy Problem from Rujia Liu? Though Rujia Liu usually sets hard problems for contests (for example, regional contests likeXi’an 2006, Beijing 2007 and Wuhan 2009, or UVa OJ contests like Rujia Liu’s Presents 1and 2), he occasionally sets easy
Ignatius and the Princess IV 链接:http://acm.hdu.edu.cn/showproblem.php?pid=1029 借鉴链接:https://blog.csdn.net/tigerisland45/article/details/52146154 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32767 K (Java/Others)Total Submission(s): 4
函数式编程 sort map forEach .... jQuery() 数组的sort 方法 传入一个匿名函数 就是函数式编程 ie9 以上的浏览器支持 map 方法 map方法 返回一个新数组 var t = [1,3,9,10,12] for(var i in t){ console.log(t[i]) } //对数组中的每一个元素都*2 var m = t.map(function(item,index,array){ //item 当前选项 index 当前选项索引 arra
As a beginner of Crocks.js, it was a problem for we to figure out when to use .map() and when to use .chain(). Of course, using the docs help: map: State s a ~> (a -> b) -> State s b chain: State s a ~> (a -> State s b) -> State s b The