SOURCE

function myCall(context){
    let obj = context || window
    obj.fn = this
    let args = [].slice.call(arguments,1)
    let res = obj.fn(...args)
    delete obj.fn
    return res
}

Function.prototype.myApply = function(context,arr){
    let obj = context || window
    obj.fn = this
    let args = [].slice.call(arr)
    let res = obj.fn(...args)
    delete obj.fn
    return res
}

Function.prototype.myBind = function(context){
    let obj = context || window
    let args = [].slice.call(arguments,1)
    let fn = this
    let bound = function(){
        let params = [].slice.call(arguments)
        fn.apply(this.constructor === fn?this:obj,args.concat(params))
    }
    bound.prototype = Object.create(fn.prototype)
    return bound
}

Object.prototype.myCreate(proto){
    function fn(){}
    fn.prototype = proto
    return new fn()
}