JavaScript random generate 0 or 1 integer

Question

I am trying to generate random 0 or 1 as I am writing a script to populdate my database. If it is 1, I will save it as male and 0 the other way around.

Inside my JavaScript:

Math.floor((Math.random() * 1) + 1);

I used this to generate either 1 or 0. However, with the code above, it always return me with 1. Any ideas?

Math.floor(Math.random() + 0.5); – shiyon sufa Apr 23 '21 at 22:42 — shiyon sufa, Apr 23 '21 at 22:42

score 223 · Accepted Answer · answered Jul 17 '17 at 05:47

223

You can use Math.round(Math.random()). If Math.random() generates a number less than 0.5 the result will be 0 otherwise it should be 1.

answered Jul 17 '17 at 05:47

Alexander Elgin

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let oneOrZero = (Math.random()>0.5)? 1 : 0; – Combine Jan 11 '18 at 20:41
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Thank you for saving me brain cells. :) – clockworked247 Jun 17 '18 at 08:06
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@Combine Should that be `let oneOrZero = (Math.random()>=0.5)? 1 : 0;`? – Chad Johnson Sep 07 '20 at 00:15
to have fifty-fifty use Chad Johnson's – wlf Sep 05 '21 at 17:07

score 2 · Answer 2 · edited Dec 16 '20 at 03:18

2

There is a +1 with Math.random, so it will always going to add 1 to the randomly generated number. You can just randomly generate a number, since Math.random will generate any floating number between 0 & 1, then use if.. else to assign 0 or 1

var y = Math.random();
if (y < 0.5)
  y = 0
else
  y= 1
console.log(y)

edited Dec 16 '20 at 03:18

Community

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answered Jul 17 '17 at 05:50

brk

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`console.log(Math.random()<0.5?0:1)` – pbies Jan 22 '21 at 20:57

JavaScript random generate 0 or 1 integer

2 Answers2

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