JavaScript Interview question : Recursion

This is a short video about javascript interview question.
Idea is to create a single array from nested array.

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⭐ Timestamps ⭐

0:00 Intro
02:04 Design overview
05:49 CSS layout for onboarding
11:00 Stepper and Header components
12:10 Step state
23:45 Handle input data

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[anonify_ai]

Can you explain why the _ was used i can't understand that part

[GeorgiiKoni]

That is not an optimal solution. A normal company expects an absolutely different way to solve this problem, better to use a stack, or a recursion at least. But with a recursion, you will come across to maximum call stack