uncurrying() in JavaScript.

uncurrying.js

Function.prototype.uncurrying = function() {
    var _this = this;
    return function() {
        return Function.prototype.call.apply(_this, arguments);
    };
};

/*var push = Array.prototype.push.uncurrying();
var a = [];
push(a, 1, 2, 'zensh');
console.log(a);

var concat = String.prototype.concat.uncurrying();
var b = concat('Hello,', 'zensh!');
console.log(b);*/

Here is an ES6 version to consider:

Function.prototype.uncurrying = function() {
  return (...x) => this.call(...x)
}

The first parameter to #call is the intended this value.
In the case of push(a, 1, 2, 'zensh'), the a array will be the this value.
In the case of concat('Hello,', 'zensh!'), the 'Hello' will be the this value. However, this must be an object so 'Hello' is implicitly converted to an object using the String object wrapper.