Defining point of functional programming -

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i can enumerate many features of functional programming, when friend asked me define functional programming me? couldn't.

i defining point of pure functional programming computation done in functions no side effects. is, functions take inputs , return values, not change hidden state, in paradigm, functions more closely model mathematical cousins.

this nailed down me when started playing erlang, language write-once stack. however, should clarified there difference between programming paradigm, , programming language. languages referred functional provide number of features encourage or enforce functional paradigm (e.g., erlang it's write-once stack, higher order functions, closures, etc.). functional programming paradigm can applied in many languages (with varying degrees of pain).


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