Nodejs Number Calculate valueOf() return x; };

Method Source Code

function foo(a, b) {
    var result = a + b;
    if (result)//from  w  w w  . j a v a 2  s .c om
        return (a + b) + result + this;
    else
        return this.f;
}

noInline(foo);

var x;
Number.prototype.valueOf = function() { return x; };

function test(this_, a, b, x_) {
    x = x_;
    var result = foo.call(this_, a, b);
    if (result != (a + b) * 2 + x_)
        throw "Error: bad result: " + result;
}

for (var i = 0; i < 100000; ++i)
    test(5, 1, 2, 100);

test(5, 2000000000, 2000000000, 1);
test(5, 1073741774, 1073741774, 1000);

Related

1. tan()

   Number.prototype.tan = function() {
       return Math.tan(this);
   

2. testNumber()

   function Number(){
     this.start = 20
     this.testNumber();
     this.answer = 1
   };
   Number.prototype.testNumber = function(){
     var i = 1;
     var start = this.start;
     while(i <= 20){
   ...
   

3. trim(a, b)

   Number.prototype.trim = function(a, b) {
     var min = Math.min(a, b),
         max = Math.max(a, b);
     return Math.min(Math.max(parseInt(this, 10), min), max);
   };
   

4. tween(target, position)

   Number.prototype.tween = function(target, position){
     return this + (target-this) * position;
   };
   

5. twos(n)

   Number.prototype.twos = function(n) {
     if (this >= 0) {return pad(this.toString(2),n)}
     var max = Math.pow(2,n-1);
     return "1" + pad((max + this).toString(2),n-1)
   function pad(num, size) {
       var s = "00000000000000000000" + num;
       return s.substr(s.length-size);
   Number.prototype.twos = function(n) {
     var ret = "";
     while(n)
       ret += ( (this >> --n) & (1) );
     return ret;
   };
   

6. with_sign()

   Number.prototype.with_sign = function(){
     return ( this > 0 ) ? "+"+this : this.toString();