<html>
<head>
</head>
<body>
<script type="text/javascript">
Array.prototype.myForEach = function(fn) {
var arr = this,
len = arr.length,
arg2 = arguments[1] || window;
for(var i = 0; i < len; i++) {
fn.apply(arg2, [arr[i], i, arr]);
}
};
Array.prototype.myFilter = function(fn) {
var arr = this,
len = arr.length,
arg2 = arguments[1] || window,
newArr = [];
for(var i =0; i < len; i++) {
var item = deepClone(arr[i]);
fn.apply(arg2, [item, i, arr])? newArr.push(item): ''
}
return newArr;
}
Array.prototype.myMap = function(fn) {
var arr = this,
len = arr.length,
arg2 = arguments[1] || window,
newArr = [];
for(var i =0; i < len; i++) {
var item = deepClone(arr[i]);
newArr.push(fn.apply(arg2, [item, i, arr]));
}
return newArr;
}
Array.prototype.myReduce = function(fn, initialValue) {
var arr = this,
len = arr.length,
arg2 = arguments[2] || window;
for(var i = 0; i < len; i++) {
initialValue = fn.apply(arg2, [initialValue, arr[i], i, arr]);
}
return initialValue;
}
Array.prototype.myEvery = function(fn) {
var arr = this,
len = arr.length,
arg2 = arguments[1] || window,
flag = true;
for(var i = 0; i < len; i++) {
if(!fn.apply(arg2, [arr[i], i, arr])) {
flag = false;
break;
}
}
return flag;
}
Array.prototype.mySome = function(fn) {
var arr = this,
len = arr.length,
arg2 = arguments[1] || window,
flag = false;
for(var i = 0; i < len; i++) {
if(fn.apply(arg2, [arr[i], i, arr])) {
flag = true;
break;
}
}
return flag;
}
function deepClone(source, target) {
var target = target || {};
for(var key in source) {
if(typeof(source[key]) === 'object' && source[key] !== null) {
if(Object.prototype.toString.call(source[key]) === '[object Object]') {
target[key] = {};
} else if(Object.prototype.toString.call(source[key]) === '[object Array]') {
target[key] = [];
}
deepClone(source[key], target[key]);
} else {
target[key] = source[key]
}
}
return target;
}
var arr = [{id: 1}, {id: 2}];
arr.myForEach(function(item, index, myArr){
item.id = item.id +1;
});
var arrFilter = arr.myFilter(function(item, index, myArr) {
return item.id > 2;
});
var arrMap = arr.myFilter(function(item, index, myArr) {
return item.id = item.id + 2;
});
var arr1 = [1, 3, 5, 6];
console.log(arr1.myReduce(function(prev, elem){
return prev = prev + elem;
}, 0));
console.log(arr1.myEvery(function(item){
return item > 2;
}));
console.log(arr1.mySome(function(item){
return item > 2;
}));
console.log(arr);
var obj1 = {
a: 1,
b: {
c: {
d: 4
}
},
e: null,
f: undefined,
g: false,
h: [{id: 1}, 2, {child: {name: 'test'}}]
};
var obj2 = {};
deepClone(obj1, obj2);
console.log(obj2);
</script>
</body>
</html>
