Repeat a string: with recursion

Tell us what’s happening:
What does this return do? I don’t get why it is necessary to complete the exercise?

“function repeatStringNumTimes(str, num) {
return num > 0? str + repeatStringNumTimes(str, num-1):”";
repeatStringNumTimes(“abc”, 3);

Your code so far

function repeatStringNumTimes(str, num) {
num > 0? str + repeatStringNumTimes(str, num-1):"";

repeatStringNumTimes("abc", 3);

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Challenge: Repeat a String Repeat a String

Link to the challenge:

It is not. There are several ways to solve this challenge that do not involve recursion.