creating an array with random binary values (0,1) in javascript

Question

I'm new to JavaScript and trying to solve an optimization problem. How can I create an array with 20 random binary values of [0, 1]? For instance something like:

[0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, ...]

The distribution of these binary values in the array should be random. Thanks

^ I'm with @jrook: This has nothing to do with genetic algorithms! — SDG
– SDG, Commented Nov 26, 2017 at 7:46
I'm trying to solve an optimization problem related to roads management. So 1: means treat the road ; 0: Don't treat the road . I'm using this array to create an initial random population based on the number of road segments i have. — Waleed
– Waleed, Commented Dec 13, 2017 at 2:36

whackamadoodle3000 · Accepted Answer · 2017-11-26 05:29:34Z

2

Try this for loop

var arr = [];
for (var i=0;i<20;i++){
     arr.push(Math.round(Math.random()))
}
console.log(arr)

answered Nov 26, 2017 at 5:29

whackamadoodle3000

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synthet1c · Accepted Answer · 2017-11-26 05:58:45Z

1

You could create an array using the constructor, which allows you to set the size, then Array#fill it with a value, then Array#map it with either 1 or 0 based on Math.random()

console.log(
  new Array(20).fill(1).map(x => (Math.random() >= .5) ? 1 : 0)
)

<script src="https://codepen.io/synthet1c/pen/KyQQmL.js"></script>

edited Nov 26, 2017 at 5:58

answered Nov 26, 2017 at 5:29

synthet1c

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1 Comment

Nina Scholz Over a year ago

you could return +(Math.random() >= .5), with a casting to number

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