abozhilov

// In ECMA-262 5th edition all methods of Array.prototype are intentionally generic. It means if you pass different
// native object than array for the this value, the particular method will work in same way as for array instances. 
// ECMA-262 does not define how those methods will work if you pass a host object for the this value. That behavior // is implementation dependent. 

// For example: 
var arr = []; 
Array.prototype.push.call(arr, 1, 2);

arr[0]; //1
arr[1]; //2

abozhilov

function func(a, f) {
    return function (args) {
        args.__proto__ = a;
        f.call(this, args);
    };
};


var f = func({foo : 10, bar : 20}, function (args) {
    print(args.foo, args.bar);

abozhilov

function valueRange(start, end) {
    return function (value) {
        return Math.min(Math.max(value, start), end);
    };
}

//Get new value range [0, 20]
var f = valueRange(0, 20);

console.log(f(10)); //10

RReverser

RegExp.prototype.matches = function* (str) {
  let moreThanOnce = this.global || this.sticky;
  let myLastIndex = 0;
  
  do {
    // preserve lastIndex of another .exec() calls on same regexp
    let savedLastIndex = this.lastIndex;
    // use own state for lastIndex to match our str
    this.lastIndex = myLastIndex;
    let match = this.exec(str);