Stack

Definition

A Last-In, First-Out (LIFO) data structure. In JS, arrays can act as stacks using `push()` and `pop()`. Used for managing function invocations, undo/redo, and bracket matching.

Explain Like I'm New

A stack of plates. You can only add a plate to the top, and you can only remove a plate from the top.

Interactive Coding Challenges

Valid Parentheses

Solution Code

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O(N) Time, O(N) Space.