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 two strings, `str1` and `str2`, find the index of the extra character that is present in only one of the strings.

> **Note:** If multiple instances of the extra character exist, return the index of the first occurrence of the character in the longer string. 


**Constraints:**
* $0 \leq$ `str1.length`, `str2.length` $\leq 1000$
* Either `str2.length` $=$ `str1.length + 1`, or, `str1.length` $=$ `str2.length + 1`
* The strings consist of lowercase English letters.

# Examples


Try to solve the Find the Difference problem.