Learn essential coding patterns to answer problems and prepare for tech companies' interviews.

Ace the JavaScript Coding Interview

This module teaches us the underlying patterns behind common coding interview questions. By learning these essential patterns, we'll be able to unpack and answer any problem the right way—just by assessing the problem statement. This approach was created by FAANG hiring managers to help us prepare for the typical rounds of interviews at major tech companies like Apple, Google, Meta, Microsoft, and Amazon.

By the end of this module, we'll have the skills we need to unlock even the most challenging questions, grok the coding interview, and level up our career with confidence.

Coding Interview Patterns

# Statement
Given an arithmetic expression in a #key# **Reverse Polish Notation (RPN)**: Reverse Polish Notation is a mathematical notation in which every operator follows all of its operands. #key# as an array of strings, `tokens`, your task is to evaluate and return the value of the given expression.

**Points to consider:**

* Valid operators are `+`, `-`, `*`, and `/`. 

* Each operand can be an integer or another expression. 

* The division between two integers should truncate toward zero.

The given Reverse Polish Notation expression is guaranteed to be valid. This ensures that the expression always evaluates to a result and that there are no division-by-zero operations.

**Constraints:**

- $1 \leq$ `tokens.length` $\leq 10^3$

- `tokens[i]` is either an operator (`+`, `-`, `*`, or `/`) or an integer in the range $[-200, 200]$.

# Examples

Try to solve the Evaluate Reverse Polish Notation problem.