函数柯里化
一、柯里化
柯里化是将函数和参数结合产生一个新的函数
二、函数柯里化例子
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<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>函数柯里化</title>
</head>
<body>
<script type="text/javascript">
function add(...values) {
let sum = 0;
for(var val of values) {
sum += val;
}
return sum;
}
Function.prototype.curry = function() {
let slice = Array.prototype.slice;
let defaultValue = slice.call(arguments);
let that = this;
return function() {
return that.apply(this, defaultValue.concat(slice.call(arguments)))
}
}
let add1 = add.curry(1,2);
console.log(add1(5)); //8
console.log(add1(3)); //6
</script>
</body>
</html>
3、一个有用的示例（数组排序）
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>函数柯里化</title>
</head>
<body>
<script type="text/javascript">
Function.prototype.curry = function() {
let slice = Array.prototype.slice;
let defaultValue = slice.call(arguments);
let that = this;
return function() {
return that.apply(this, defaultValue.concat(slice.call(arguments)))
}
}
Array.prototype.sortDescending = Array.prototype.sort.curry((a, b) => b - a);
let data = [1, 5, 2, 3, 7, 4];
console.log(data.sortDescending())
</script>
</body>
</html>
4、函数柯里化 存钱的例子
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>函数柯里化 存钱例子</title>
</head>
<body>
<script type="text/javascript">
function kelihua(fn) {
let arr = [];
function res() {
if(arguments.length == 0) {
return fn.apply(null, arr)
} else {
arr.push(...arguments)
}
}
return res;
}
let countMoney = kelihua(function() {
let s = 0
for(let i = 0; i < arguments.length; i++) {
s += arguments[i]
}
return s;
})
// 2018-01-01 存了1毛钱
countMoney(1)
// 2018-01-02 存了2毛钱
countMoney(2)
// 2018-01-03 存了3毛钱
countMoney(3)
// 2018-01-04 存了4毛钱
countMoney(4)
// 统计这笔巨额存款 输出结果为 10
console.log(countMoney())
</script>
</body>
</html>