Why javascript don't have a random function to generate integers? [closed]

Question

I'm using this function to generate random int values :

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

It works perfectly but makes me wonder ... why there is no randomInt and randomFloat in javascript?

Answer 1

JavaScript has a Number type which is a 64-bit float; there is no Integer type per se. Math.random by itself gives you a random Number, which is already a 64-bit float. I don't see why there couldn't be a Math.randomInt (internally it could either truncate, floor, or ceil the value). There is no good answer as to why the language doesn't have it; you would have to ask Brendan Eich. However, you can emulate what you want using Math.ceil or Math.floor. This will give you back a whole number, which isn't really an Integer typewise, but is still a Number type.

Answer 2

Because Javascript doesn't have those types. Pure javascript only has a generic number type.

More info on Javascript types may be found here and here.

You may also want to look into this question: Integers in JavaScript

The marked answer says, and I quote:

There are really only a few data types in Javascript: Objects, numbers, and strings. As you read, JS numbers are all 64-bit floats. There are no ints.