Being functional

Functional programming is a programming paradigm that involves algorithm composition, to be dealt on the same lines as mathematical function evaluations. This implies that the output of these functions would purely depend on the inputs provided. Moreover, any applicable data structures that the algorithm would need to create the output would be transient, having a lifetime within the function scope, and thus help in avoiding state mutation. It is also a powerful declarative programming paradigm, which involves leveraging expressions for readable code in place of procedural in-line statements.