js currying & js 科里化

js currying & js 科里化

var test = (
    function (a){
        console.log(`a2 =`, a);// 1
        // console.log(`b2 =`, b);
        // undefined
        this.a = a;
        console.log(`this.a1 =`, this.a);// 1
        return function (b) {
            console.log(`this.a2 =`, this.a);// 1
            console.log(`b3 =`, b);// 4
            // ??? b always equal to test passed param's value
            // passed & unused args/params
            return this.a + b;
        };
    }(
        function (a, b) {
            console.log(`a1 =`, a);// 1
            console.log(`b1 =`, b);// 2
            return a;
        }(1, 2)
        // fixed args
    )
);

console.log(`test(4) = `, test(4));

// a1 = 1
// b1 = 2
// a2 = 1
// this.a1 = 1
// this.a2 = 1
// b3 = 4
// test(4) =  5

// js curry & js 科里化

console.log(`\ntest(5) = `, test(5));
// b3 = 5
// test(5) =  6

柯里化

所谓"柯里化"，就是把一个多参数的函数，转化为单参数函数;

https://www.ruanyifeng.com/blog/2017/02/fp-tutorial.html

柯里化(Currying), 又称部分求值(Partial Evaluation)，是把接受多个参数的函数变换成接受一个单一参数(最初函数的第一个参数)的函数，并且返回接受余下的参数而且返回结果的新函数的技术;

https://www.zhangxinxu.com/wordpress/2013/02/js-currying/

柯里化有3个常见作用:

1. 参数复用
2. 提前返回
3. 延迟计算/运行;

https://www.haorooms.com/post/js_currying

http://www.alloyteam.com/2013/08/javascript-zhong-you-qu-di-fan-ke-li-hua-ji-shu/

https://llh911001.gitbooks.io/mostly-adequate-guide-chinese/content/ch4.html

https://juejin.im/post/5af13664f265da0ba266efcf

js in deep

https://github.com/mqyqingfeng/Blog

https://blog.fundebug.com/2018/10/30/33-js-concepts/

refs

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