Knowledge of JavaScript Array methods is fundamental. It allows writing code in functional style. As not all of those methods are immutable developers should know when to handle or avoid data mutations. Another essential feature of array methods is context handling as it could dramatically simplify your code.

Functional programming – this words you might read a lot of times during last year, especially in JavaScript context. Today I’ll try to demystify its fundamental principles for newbies in easiest and beginner-friendly manner.