26: How To Create A Random Number Using JavaScript | Create A Random Number | JavaScript Tutorial

In this JavaScript tutorial you will learn how to create a random number using JavaScript. Generating a random number using JavaScript is a bit more complicated than you might think, since JavaScript doesn't have a simple function or method that can do it. Therefore I decided to create this seperate video that teaches you how to do it using our own JavaScript code.

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Daniel Simionescu
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[TheEyesOfTheJEagle]

what is wrong with just "let getRandom = Math.floor( (Math.random() * (range - start) ) + start );
its way easier than looping.

[ozarkchinquapin]

I really really really like your videos. There are a LOT of videos out there but being able TO TEACH is a GIFT. And you, sir, have that gift. Thank you so much for all your videos and hard work.

[doesnotmatter-vh]

this is the way to do it with less stress love the video and i learned from them


let ran = function (start, end)
{
let ac_end = end - start;

return Math.floor((Math.random() * ac_end) + start)
}

console.log(ran(40, 50));

[kwartai]

I have been looking at different java tutorials, but you are the first one to be so clear at explaining stuff, thanks

[theanimalworld]

This is very impressive video that I never met before. Thank

[TrungTran-rztz]

Hi everyone, just want to suggest a more "random" way of doing this, that is using Math.round() instead of Math.floor(), because that will round off the number (either up or down) rather than always round it down.
When we use Math.floor(), then for example if we run getRandomNumber(5, 12), we will almost never get the number 12, while in theory we should get 12 every once in a while because the odd is not that low.
The reason is that 12 only get returned if Math.random() return exactly 1, which almost never ever happen.

[pacedelacruz]

You're such an Angel. I love the way you teach. Everything is so clear and you make it so easy to understand. Thank you so much ❤️

[swallowedinthesea]

Nice! JS's random seems more complex than Python's random module.

Stay safe during the Coronavirus!

[Comma_diep]

Thanks you this helps a lot I think Ive see this done with max and min

[inayatahmadzai]

Thank you so much it was easy to understand.

[qingyido]

What about using shuffle arr and chose the 1st number as the random integer number? But in this way do all the numbers have equal probability?

[mohamedatef]

Very useful and helpful because it helped me to make a simple generate number project.

[epi]

Hi its possible that i can get a random number via time base which is every 12am random number will be executed?

[Soda-stream]

Hy nice vidd, but 1 question, i want to generate number for example 123456, and the last number generate 6 to 5 to 4, than 5 going 4 .

[sodiqayilara]

great great video, as a beginner, I found this useful.

[natqe]

What about simple range = range - start?

[ideshmaaerdene-ochir]

Hello, I've got one question for you. When you refreshing the browser the random numbers you created is still there in the console. But mine is not there, why? After refreshing the previous one is gone. What should i do? Thank you.

[yongjung]

Thank you for the great lessons! You have saved my day again!

[KiaSoulTravels]

can we do this but instead of numbers can we use a directory in the webserver with 1000 text files and can we make output the random text file into the users browser so he can copy a random text

[rasulakhundov]

Thank you so much. You really good teacher!