JS一些重要函数

防抖函数

        避免短时间内的函数多次调用影响性能

function debounce(func , wait){let timer;return (...args) => {clearTimeout(timer);timer = setTimeout(() => {return func(args)} , wait)}
}

函数柯里化

        将多参函数以单参的形式传递

function curry(fn){return function curryInner(...args){if(args.length >= fn.length){return fn(...args)    }else{return (...args2)=>{return curryInner(...args , ...args2)}}   }
}

组合与管道

        不同函数的连续调用并求值

        原型

//root
function compose(...funcs){return function(x){return f(g(v(z(...(x)))))}
}

        递归写法

function compose(...funcs){let count = funcs.length - 1;let result;return function fn(x){if (count < 0){return result;}else{result = funcs[count--](x)//先数组，后count--return fn(result);}}
}

        迭代写法

function compose(...funcs){let callback = function(f,g){return function(x){return f(g(x))}}let fn = funcs[0]for (let i = 1;i < funcs.length; i++){fn = callback(fn , funcs[i])}return fn;
}

        reduce写法

function compose(...funcs){return funcs.reduce((a , b) => (x) => a(b(x)))
}

        管道（pipe） -> 反向组合（从左向右读函数）

function compose(...funcs){return funcs.reverse().reduce((a , b) => (x) => a(b(x)))
}

后续会补充，此文章用来辅助记忆