Why use three (...newArr) in the following. is This syntax??

Question

let newArr = ['Three', 'Four'];
let = ['One', 'Two', ...newArr, 'Five'];
console.log(arr);arr

Answer 1

Its the spread syntax. refer to the mdn for full explanation.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax