How to output from a loop in the form of arrays

Question

I need to know how to output data from loop codes in the form of arrays . It may sound simple but it's really giving me a headache. Help will be much appreciated
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Answer 1

Do you want to output each element in a single line?

x = [4, 3, 2, 1];
x.forEach(function(el) {
console.log(el);
})

Or in a single line?
console.log(x);
(Here you wouldn't need a loop?)