Functional Programming in JavaScript Part 1 - Pure Functions

In this multi-part series, i'll be explaining how to bring FP in JS to a project near you. 😆

[Parasin]

What are the performance implications to this approach? For example, as an array grows in size, and we are now copying it, don't we incur N^2 space complexity? Even though the copied array is garbage collected once the function scope is gone, it's something I was concerned about.