Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. Note that you must do this in-place without making a copy of the array.
Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
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No-Library (pure JS), HTML, CSS, JavaScript
author(s): Sophie Bremer
create an accurate timer in Javascript
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