Question about delimiter :
console.log(Array(2).join('a'));
console.log(['', '', ''].join('a'));
Why does the above code only return:
a
aa
instead of:
aa
aaa
Array(2) creates an array with two empty or undefined elements in an array [undefined, undefined], so shouldn’t it output aa?
Because when you are calling .join('a'), you are basically placing as in between the objects and concatenating them.
Here, ['', '', ''].join('a') will produce aa, because there are only two in-between places where a can be placed and concatenated.
Same reasoning for Array(2).join('a')