Functional Programming Concepts

1. Purity

   • Pure functions only operate on its input parameters.

   • No side effects.

2. Immutability

   • There are no variables in FP

   • Loops are implemented via recursion

3. Higer Order Functions

   • Higher order functions take functions as parameter or returns a function or does both.

4. Closure

   • A closure is a functions scope kept alive by a reference to that function.

5. Function Composition

   • Put together reusable functions to compose new functions.

   • More like the concept of composite function f(g(x)) from math.

6. Point Free Notation

   • In this notation, no need to specify parameters when writing functions.

7. Currying

   • A curried function is a function that takes only one parameter at a time.

   • This helps make functions more generalized for reuse.

Summarised from here