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

You're given an integer array, `arr`. Return a resultant array so that `res[i]` is equal to the product of all the elements of `arr` except `arr[i]`.


Write an algorithm that runs in $O(n$) time without using the division operation.

**Constraints:**

- $2 \leq$ `arr.length` $\leq 10^3$
- $-30 \leq$ `arr[i]` $\leq 30$
- The product of any prefix or suffix of `arr` is guaranteed to fit in a 32-bit integer.

# Examples

Try to solve the  Product of Array Except Self problem.