Javascript Number add(val)

Number.prototype.add     = function(val){ return this + val; };
Number.prototype.subtract  = function(val){ return this - val; };
Number.prototype.multiply  = function(val){ return this * val; };
Number.prototype.divide   = function(val){ return this / val; }; 
Number.prototype.square   = function () { return this*this; }; 

console.log((3).add(5));//from  w  w  w . j a  v a2  s .co m
console.log((5).subtract(1).add(3));
console.log((3).multiply(2));
console.log((10).divide(5));
console.log((5).square());