function partial(fn) {	
	var args = Array.prototype.slice.call(arguments);
	var args = args.slice(1);
 
	return function() {
		var args1 = Array.prototype.slice.call(arguments);
 		var newArgs = args.concat(args1);
 		var x = fn.apply(null, newArgs);
		return x;
	}
}
 
 
function add(a, b) { return a + b; }
function mult(a, b, c, d) { return a * b * c * d; }
 
var add5 = partial(add, 5); // Мы получили функцию с 1 аргументом, которая прибавляет к любому числу 5
 
console.log(add5(2)); // 7
console.log(add5(10)); // 15
console.log(add5(8)); // 13
 
var mult23 = partial(mult, 2, 3); // мы зафиксировали первые 2 аргумента mult() как 2 и 3
 
console.log(mult23(4, 5)); // 2*3*4*5 = 120
console.log(mult23(1, 1)); // 2*3*1*1 = 6

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