Actually repeat is easy to read
If you want to make string of 52 a's with repeat is so easy
const a = 'a'.repeat(52);
console.log(a); // "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
console.log(a.length); // 52
Array index starts from 0 which means it will print 52 times.
Yass, and since join acts as 'glue', using 'a' as glue for 52 nothings will print 'a' 51 times. Give it a try ;)
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