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 unsorted integer array, `nums`, return the smallest missing positive integer. 
Create an algorithm that runs with an $O(n)$ time complexity and utilizes a constant amount of space.

> **Note:** The smallest missing positive isn't the first positive number that's missing in the range of elements in the input, but the first positive number that’s missing if we start from $1$.


**Constraints:**

- $1 \leq$ `nums.length` $\leq 10^5$

- $-2^{31} \leq$ `nums[i]` $\leq 2^{31} - 1$


Try to solve the First Missing Positive problem.