Evaluate Reverse Polish Notation | Leetcode 150 | Stack | Javascript

Evaluate Reverse Polish Notation | Leetcode 150 | Stack | Javascript

In this video, we will tackle the problem of evaluating expressions in Reverse Polish Notation (RPN), also known as postfix notation, using a stack. This is a common coding interview question (Leetcode 150) that tests your understanding of stack data structures and your ability to efficiently evaluate mathematical expressions.

What you'll learn:
Reverse Polish Notation (RPN): We'll start by explaining what Reverse Polish Notation is and how it's different from infix notation (the standard arithmetic notation we use in daily life).

Evaluating Expressions: You'll learn how to evaluate an RPN expression step by step using a stack, handling operands and operators efficiently.
Implementation in JavaScript: We’ll dive into the actual coding implementation using JavaScript and explore each part of the code to make sure the logic is clear.

Time Complexity Analysis: We'll analyze the time complexity of our solution to understand how efficient it is.

Edge Cases: We'll also discuss and handle potential edge cases to ensure robustness.

Problem:
Given an array of strings that represent an expression in Reverse Polish Notation, evaluate the expression and return the result. Operators can be +, -, *, and /. The solution needs to efficiently evaluate the expression with a stack-based approach.

Code Walkthrough:
We'll break down the problem and show how to use a stack to push operands (numbers) and apply operators as we encounter them.
For each operator, we will pop the required operands from the stack, apply the operation, and push the result back to the stack.
Finally, the result will be the only value left in the stack.
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