26: How To Create A Random Number Using JavaScript | Create A Random Number | JavaScript Tutorial
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- Опубліковано 26 сер 2024
- 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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what is wrong with just "let getRandom = Math.floor( (Math.random() * (range - start) ) + start );
its way easier than looping.
Yes that is a better solution that takes up less resources :)
TheEyesOfTheJEagle Not only that but there is zero chance of accidentally having the two lines of code not be exactly the same! Also there is no need to store the result in a variable before returning it.
You could also use an if statement to check if the number is higher than the range, and if so set it to be the passed in range...
if(getRandom > range){ getRandom = range; }
TheEyesOfTheJEagle would var instead of let work?
I don't understand this solution, I found it in MDN, but I did not understand it .. so could please explain that solution? Especially this part >> (range - start) ) + start
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.
This is very impressive video that I never met before. Thank
this is the way to do it with less stress imo......... 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));
I have been looking at different java tutorials, but you are the first one to be so clear at explaining stuff, thanks
Thanks you this helps a lot I think Ive see this done with max and min
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.
Trung Tran Not sure I agree with that as you will get 11 if the random number is above 10.5.
Thank you so much it was easy to understand.
Nice! JS's random seems more complex than Python's random module.
Stay safe during the Coronavirus!
"Stay safe during covid!" •_•
"2 years ago" ○_○
"Edited" ▪︎-▪︎
@@vanessaaguilar4025 👌
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 ❤️
Very useful and helpful because it helped me to make a simple generate number project.
great great video, as a beginner, I found this useful.
Ur an awesome teacher!
Thank you so much. You really good teacher!
Thank you for the great lessons! You have saved my day again!
thank you
something that simple maths makes me wonder. the while loop is probably not need and you could just use Math.floor (Math.random() * end +1 - start) + start);
and you would not need to run the while loop. I do like the videos, though, if it wasn't for you I would be screwed as I had to learned all of them in one week and I had never known how to program. thanks!
Well done bro, I did this before and I added it to the php sign up system. My idea was to create a membership number, then I check if it was used at the database. If not, we can save it otherwise the code have to keep running. Was it a good idea ?
Maybe the did update javascript after this guide, but I prefer;
function getRndInteger(min, max) {
return Math.floor(Math.random() * (max - min) ) + min;
}
Looks more cleaner :)
Anyway...
Thanks for this tutorial and all before that =)
You may have saved me with //return Math.floor(Math.random() * (max - min) ) + min;//
tysm
Hi its possible that i can get a random number via time base which is every 12am random number will be executed?
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 .
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
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?
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.
What about simple range = range - start?
Yes that would work better :) Not sure why I didn't think of that
range -= start
Oooooo, thank you very much.
thank you !!!
Say can someone write a javascript to alter a random organizer contest winner to rig it and make a certain name or line or number more likely to win ?
around 8.54 mints. you are replacing the 10 with 'range', saying thats the Max. number, but I got confused since you placed the 10 there for getting rid of the decimal point, not as the Maximum value...??
So I created the numbers and I have a table of 1 to 90 stating 9 rows and 9 columns .. now I want to mark the number from the table I hav received using this function
thank you.
Which editor do you uses
How can I include a Number in the result?
is there dragon sleeping at the back (sniff voices lol)
How can I generate unique array of numbers that should not be repeated????
holy crap , in python you can do all of that using one word
what about non repeated random number
how to input a random generator that get result in every two minutes from 1-80?
const getRandomNumber = (from, to) => {
return scaleNumber(Math.random(), 0, 1, from, to);
}
const scaleNumber(value, srFrom, srTo, trFrom, trTo) => {
return (value - srFrom) * (trTo - trFrom) / (srTo / srFrom) + trFrom;
}
No loop, just O(n)
Php like system!
let r = Math.random().toString(36).substring(2);
document.write(r);
This one is better ^^
Does anyone know how to make the number non-repeatable?
I’m not sure but a workaround would be to inset the numbers that you picked in an array and if the generated number is already in the array then it would do the random number again until it’s new. You could do this using the do while loop. Hope this helps
What to do for not repeat a number?
good question!
Nice breathing Besse
🐶
how can i center a div box with css?
Using margins :) On a side note, knowing how to center anything in CSS is some of the first CSS you learn, so if you are in doubt about this then I would recommend watching a HTML course before getting into JavaScript. It will help you further down the road in JavaScript...
senpai what is the difference between using a function getRandom() & let getRandom = function()
My "function" episode in this playlist explains it ;)
local and global functions
function getRandom() : its a function declaration and function getRandom() : this is a function Expression means invoked function
The first is a function declaration, while the second is a function expression as you are assigning it to a variable.
why not this simple and easy :
const getRandomNumbe r= (min, max)=>{
return Math.floor(Math.random()* (max-min +1)+ min)}
Elon that's u?!
Thanks for putting the tutorial together. :)
Is there a way to Password Protect online videos (UA-cam, Vimeo... etc) with some if not all of these features?
Random Password
Set the Expiration time or date
Set the Total time a video can be viewed
Set how many times the password is allowed
Setup Password Groups
I know it's asking a lot, if you're busy, I understand. You seem to have the skills to make it happen. Just putting it out there.
Well, if you mean protecting a video that is already on UA-cam, then no. But if you mean within your own site how many times can it be viewed and such, yes, it is possible. You would need to make some sort of a view counter and then if it reaches a certain amount, I think it would be possible to lock it down or just hide it. But hey, I'm sure StackOverflow has some sort of an answer.
was this channel mtuts....... am confused!
As would be a code with 15 tens, and each tens goes up to 25 units.
the first.......
the second
You look pretty healthy for someone who does meth haha
Great lesson bro 👊
Sorry?
Oh because I pronounce "math" as "meth"? hehe
mmtuts No its a joke buddy doesn't matter who says it, they sound way to similar 😂
and the fucking third....
I can see how if you are constantly changing your start number and range number , and hate mental math that the while loop is a better solution. But this is way less code and works just the same
let myWay = Math.floor((Math.random()*6)+5);
console.log(myWay);
So basically Math.ceil is the opposite of Math.floor
I just did this to throw people who didn't watch the video off
ur not funny
@@flooow3409 it actually is, try it
i aint lying, bruh
@@calibr0636 you're cringe asf