Nodejs Random Number Get range(a, b)

Method Source Code

/*/*w w  w .  j  a v a2 s  .c o m*/
 * @Range
 *
 * add range method for math
 * */
Math.range = function (a, b) {
  return this.floor(this.random() * a) + b;
};

Related

1. iRandom(a, b)

   Math.iRandom = function(a, b){
     if (arguments.length == 1){
       return Math.round(Math.random() * a);
     }else if (arguments.length == 2){
       return a + Math.round(Math.random() * (b - a));
   };
   

2. rand(l, u)

   Math.rand = function (l, u) {
     return Math.floor((Math.random() * (u - l + 1)) + l);
   };
   

3. rand(min, max)

   Math.rand = function(min, max) { 
     return Math.floor(Math.random() * (max - min) + min); 
   

4. random(_minNum,_maxNum,_rejArr)

    function random(_minNum,_maxNum,_rejArr){
        var minNum=_minNum||4,
            maxNum=_maxNum||17,
            rejArr=_rejArr||[],
            num=-1,
            flag=true;
        num = Math.floor(Math.random()*(maxNum-minNum+1)+minNum);
        if(rejArr.length>maxNum-minNum) return -1;
        for(var i=0,len=rejArr.length;i<len;i++){
   ...
   

5. random(low, high)

   function random(low, high) {
     var rand = (Math.random() * high) + low;
     return rand;
   

6. random(min, max)

   function random(min, max) {
       return Math.floor(Math.random() * (max - min)) + min;
   

7. random(min, max)

   function random(min, max) {
      return Math.floor(Math.random() * (max - min + 1)) + min;