DEV Community

Rando.js: replacing Math.random()

nastyox on March 08, 2020

🙉 What's all the hullabaloo? There's now a vastly better alternative to JavaScript's built-in Math.random() that will make your life ea...

Read full post

mich • Jul 21 '20

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 • Jul 21 '20

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 • May 16 '20 • 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

Adam Crockett 🌀 • Jun 11 '20

food syntax 🌭

Unexpected hotdog.

nastyox • May 18 '20

Nice tip. Thanks :)

krishna kakade • Mar 18 '20

I added this in my reading list looks interesting 🐱‍🏍❤

Carlos V. • May 16 '20

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

Spartak • May 29 '20

It is using Math.random, just added sugar around it.
Made a ton prototypes long time ago for such tasks

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

Michael Willian Santos • Jun 25 '20

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

andy chen • Sep 24 '20

Cool !

rekreanto • Oct 4 '20

Just love the design of the website <3. The combination of sparseness, clarity and slight aliveness/animation is awesome! randojs.com/

nastyox • Oct 5 '20

thanks a bunch!!

CP • Jun 1 '20

Very nice work!

nastyox • Jun 27 '20

It's been getting some attention, so I upgraded it to a cryptographically secure random now. Thanks for being interested in it from the start.

Joey The Dev • Jun 2 '20

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

Javier Escobar • May 18 '20

I think I could use this sometime... Thanks!

Cledilson Nascimento • Jul 23 '20

Very good! randoSequence () is excellent! / Muito bom! randoSequence() é excelente!

Harsh Singh • Aug 14 '20

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