The ability to quickly combine functions is functional programming's defining feature.
A programming approach known as functional programming places more emphasis on the evaluation of expressions than the execution of instructions. Functional programming language is how the Erlang programming language is described.
It's quicker because it's simpler to create code in a style that compiles more quickly. Switching languages won't definitely result in a speed improvement, but if you had begun with a functional language, multithreading could have likely been accomplished with a lot less programming work.
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