The correct way to write a JavaScript array is:
[ 1, 2, 3 ].For example, this array has 5 at index 0 and 10 at index 1:
const array = [ 5, 10 ];
console.log(array.length); // 2
console.log(array[0]); // 5
console.log(array[1]); // 10
And this array has "Hello" at index 0, false at index 1 and 55 at index 2:
const array = [ "Hello", false, 55 ];
console.log(array.length); // 3
console.log(array[0]); // Hello
console.log(array[1]); // false
console.log(array[2]); // 55