How to insert a new element in between all elements of a JS array?

Question

I have an array [a, b, c]. I want to be able to insert a value between each elements of this array like that: [0, a, 0, b, 0, c, 0].

I gues

Answer 1

You can use map() with ES6 spread syntax and concat()

var arr = ['a', 'b', 'c']
var newArr = [0].concat(...arr.map(e => [e, 0]))

console.log(newArr)