Random number between two numbers (JavaScript)

Here’s my little function to return a random number between two numbers:

function randomNumberBetween(from, to, allowZero){
  var diff=(to+1)-from;
  var rnum = Math.floor((Math.random() * diff));
  rnum+=from;
  if(rnum==0 && allowZero===false){ 
    rnum=from==0?1:from; // just make it easy for now
  }
  return rnum;
}

function randomNumberBetween(from, to, allowZero){

var diff=(to+1)-from;

var rnum = Math.floor((Math.random() * diff));

rnum+=from;

if(rnum==0 && allowZero===false){

rnum=from==0?1:from; // just make it easy for now

}

return rnum;

}

The ‘allowZero’ flag does just that.. though if you use this function you may wish to change what it does if it does generate a zero.

It’ll work on negative to positive numbers, but if you want decimal numbers (i.e. 0.0 to 1.0) you would need to do between 1 and 10, and then divide by 10 to get your result.

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