## DEV Community nastyox

Posted on • Updated on

# Rando.js: replacing Math.random()

## 🙉 What's all the hullabaloo?

There's now a vastly better alternative to JavaScript's built-in Math.random() that will make your life easier. Rando.js helps JavaScript developers code randomness more simply, readably, and securely. Whether you need to find a random int/float between two numbers, pick a random value from an array, choose a random element from your jQuery object, grab a character from a string, toss a coin, or do anything of the like while even preventing repetitions, we've got you covered at a cryptographically strong level. The best part? Our library is extremely lightweight and developer friendly- which means it won't take a toll on your project, and it's uber-simple to implement. Find it online and on GitHub.

## ⚡ Fast implementation

Step 1: Paste the following script tag into the head of your HTML document:

``````<script src="https://randojs.com/2.0.0.js"></script>
``````

Or, use npm:

``````//Install:
npm i @nastyox/rando.js@2.0.0

//Then, paste this at the top of your JavaScript file:
const randojs = require('@nastyox/rando.js'), rando = randojs.rando, randoSequence = randojs.randoSequence;
``````

Step 2: Use any of the commands explained at https://randojs.com/ in the document's JavaScript as you like.

## 🎉 Examples

``````   rando()                       //a floating-point number between 0 and 1 (could be exactly 0, but never exactly 1)
rando(5)                      //an integer between 0 and 5 (could be 0 or 5)
rando(5, 10)                  //a random integer between 5 and 10 (could be 5 or 10)
rando(5, "float")             //a floating-point number between 0 and 5 (could be exactly 0, but never exactly 5)
rando(5, 10, "float")         //a floating-point number between 5 and 10 (could be exactly 5, but never exactly 10)
rando(true, false)            //either true or false
rando(["a", "b"])             //{index:..., value:...} object representing a value of the provided array OR false if array is empty
rando({a: 1, b: 2})           //{key:..., value:...} object representing a property of the provided object OR false if object has no properties
rando(\$("div"))               //{index:..., value:...} object representing a jQuery element from the provided jQuery element set OR false if the provided jQuery element set does not contain any elements
rando("Gee willikers!")       //a character from the provided string OR false if the string is empty. Reoccurring characters will naturally form a more likely return value
rando(null)                   //ANY invalid arguments return false
``````

### ⇢ Prevent repetitions by grabbing a sequence and looping through it

``````   randoSequence(5)              //an array of integers from 0 through 5 in random order
randoSequence(5, 10)          //an array of integers from 5 through 10 in random order
randoSequence(["a", "b"])     //an array of {index:..., value:...} objects representing the values of the provided array in random order
randoSequence({a: 1, b: 2})   //an array of {key:..., value:...} objects representing the properties of the provided object in random order
randoSequence(\$("div"))       //an array of {index:..., value:...} objects representing all jQuery elements from the provided jQuery element set in random order
randoSequence("Good gravy!")  //an array of the characters of the provided string in random order
randoSequence(null)           //ANY invalid arguments return false
``````

If you find this project helpful, please take a second to bookmark the website/leave it a star on GitHub. Thanks everyone. mich

This looks quite useful. Given that Math.random() returns a float, what drove your decision to make int the default return type in the numerical instances such as rando(5) and rando(5,10) instead of float? Was it an assumption that most people specifying numbers were looking for ints or something else? nastyox

Thanks! That's a great thought. And yes, that's exactly right. I've seen ints as a much more common use case than floats (excluding [0-1)), so I decided to make that the easier of the two. If you have other thoughts on the project, I'm always interested to hear feedback. You can leave a comment here, DM me on here, or create a pull request on my GitHub. Waylon Walker • Edited

Hot tip, include language after the leading backticks for codeblocks to get food syntax hilighting.

## example ## result

``````randoSequence(5)
//a random integer between 5 and 10 (could be 5 or 10)

randoSequence(5, 10)
// an array of integers from 5 through 10 in random order

randoSequence(["eeny", "meeny", "miny", "moe"])
// array of {index:..., value:...} objects representing the values of the provided array in random order

randoSequence({species: "mouse", blind: true, count: 3})
// array of {key:..., value:...} objects representing the properties of the provided object in random order

randoSequence(\$("input"))
// array of {index:..., value:...} objects representing a jQuery elements from the provided jQuery element set in random order

randoSequence("Good gravy!")
// the characters of the provided string in random order

randoSequence(null)
// ANY invalid arguments return false
``````

EDIT 🤣 corrected `hot too` to `hot tip` food syntax 🌭

``````Unexpected hotdog.
`````` Carlos V.

Looks promising! Is this library a pseudorandom one like `Math.random` or is it a true random algorithm? Spartak

It is using Math.random, just added sugar around it.

``````Array.prototype.getRandom = function () {
return this[Math.floor(Math.random() * this.length)];
};
console.log( [1, 2, 3].getRandom() )
`````` Michael Willian Santos

Amazing! I'll study in how to implement it into my projects. Thank you CP

Very nice work! Joey The Dev

Good work! I might use this in a future project. Harsh Singh

I had also created a tiny lib for generating random stuff ( integers, floats, hex colors, shuffling an array, unique IDs, etc. ) for personal use. its called kram.js

github.com/rwbeast/kram 