Front-end Job Interview Questions

前端面试

柯里化函数


function curry(fn) {
    var slice = [].slice;
    var len = fn.length;

    return function curried() {
        var args = slice.call(arguments);
        if (args.length >= len) {
            return fn.apply(null, args);
        }

        return function () {
            return curried.apply(null, args.concat(slice.call(arguments)));
        };
    };
}

var add = curry(function (a, b, c, d) {
    return a + b + c + d;
});

console.log(add(1)(2)(3)(4)); // 10
console.log(add(1, 2, 3)(4)); // 10
console.log(add(1)(2, 3)(4)); // 10

https://segmentfault.com/q/1010000004342477

`add(2)(5); // 7` & 柯里化 curry

js 实现, 函数 add(1)(2)(3); 无限极累加


"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2019-01-01
 *
 * @description add & curry
 * @augments
 * @example
 *
 */

function add( seed ) {
    function retVal( later ) {
        return add( seed + later );
    }
    retVal.toString = function() {
        return seed;
    };
    return retVal;
}
console.log(add(1)(2)(3).toString());
// 6
console.log(add(1)(2)(3));
// ƒ 6

function addBug(a){
    function s(b){
       a = a+b;
       return s;
    }
    s.toString = function(){return a;}
    return s;
}
console.log(addBug(1)(2)(3)(4));
// ƒ 10

addBug(1);
// ƒ 1
let x = addBug(1)(2);
// ƒ 3
x;
// ƒ 3
alert(addBug(1)(2)(3)(4));
// alert: 10
// true