Refactoring JavaScript for Performance and Readability

Performance-wise, be careful if you’re iterating through a flat array very often, especially if it’s a core piece of your program.

Hash function

A hash function is used to map a given key to a location in the hash table.

Strategies

Here are some straightforward to implement methods that can lead to easier to read code. There are no absolutes when it comes to clean code — there’s always an edge case!

Return early from functions:

Cache variables so functions can be read like sentences:

Check for Web APIs before implementing your own functionality: