Nodejs Utililty Methods Number Calculate

Number.prototype.frac = function() {
  return this - Math.floor(this);
};

Number.prototype.fuzzyEqual = function(otherNumber)
    return Math.abs(this - otherNumber) <= 0.00001;

Number.prototype.gcd = function(b) {
  return (b == 0) ? this : this.gcd(this % b);

Number.prototype.getDecimal = function getDecimal() {
    return parseInt(this, 10);
};

Number.getDisplayText = function(number) {
    if (number < 1000) {
        return number;
    if (number < 1000000) {
        return (number / 1000).toFixed(1) * 1 + "k";
    return (number / 1000000).toFixed(1) * 1 + "m";
};
...

Number.prototype.getHashCode = function () {
    var x = this;
    x = ((x >> 16) ^ x) * 0x45d9f3b;
    x = ((x >> 16) ^ x) * 0x45d9f3b;
    x = ((x >> 16) ^ x);
    return x;
};

Number.prototype.getHisByMs=function(){
    var ms=this;
    var date=new Date(ms);
    var his=[];
    his.push(Number(date.getHours()).addZero());
    his.push(Number(date.getMinutes()).addZero());
    his.push(Number(date.getSeconds()).addZero());
    return his;

Number.prototype.getPrecision = function getPrecision(length) {
    var value = parseFloat(this);
    if (Number.isFloat(value)) {
        return value.toString().split(".")[1].length;
    return 0;
};

var BigNumber = function(n){
  this.value = n.toString();
  this.getValue = function(){
    return this.value;
  this.getRealValue = function(){
    return Number(this.value);
  this.add = function(bnum){
...

Number.prototype.greaterThan = function(num) {
    return this > num;