+ 10

# how to pick a varible randomly in web

if i have three variables var a = "a" var b = "b" var c = "c" var rand = __randomly choosen from a,b,c__ ....please answer considering that i dont know anything about web page designing or JS...

31st Mar 2017, 9:31 AM
Code Ninja + 14
var arr = [a,b,c]; var rand = Math.floor(Math.random() * 3); arr[rand]; What this code does is that it stores the variables in an array and we create a random number to randomly access one variable from the array. But if you want it to generate random no.s each time rather than only when a function is called, just do: arr[Math.floor(Math.random() * 3)]; // no need to create the rand variable then
31st Mar 2017, 9:44 AM
Chirag Bhansali + 11
@Suraj: It will remain the same because you are changing the value of the variable and not the variable name. Note: arr[Math.floor(Math.random() * 3)]; In this line, the 3 is actually the length of the array so if the length is 50 or any other no. just replace 3 with that no.
31st Mar 2017, 10:10 AM
Chirag Bhansali + 10
thanks man! You saved my day
31st Mar 2017, 9:48 AM
Code Ninja + 8
i wanted to ask you that what iff a = "string1" b = "string2" c = "string3" will the code still be same, or it needs different code?
31st Mar 2017, 10:07 AM
Code Ninja + 8
simply Math.random() returns a value between 0 and 1 in decimal values eg. 0.67464627 To get a random no. between desired no. without decimal points use this :- var r=Math.floor(Math.random()*max )+min;
31st Mar 2017, 2:25 PM
Utkαrsh + 7
@Utkarsh Utkarsh, sorry, but if we would (for example) set min to 2 and max to 8 then we can get 10 with you code. May be this one will be better: var r = Math.floor(Math.random()*(max-min))+min ? or even: var r = Math.floor(Math.random()*(max-min+1))+min ?
13th Apr 2017, 10:25 PM
Andrew Harchenko (Tomsk) 