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You can't measure how good a programming language is.

You can if you define what 'good' means.
10 supporter.

Functional programming is not useful for most apps

Functional programming means: Program with functions that only use explicit input and return output. As opposed to procedural where you might have no output but side-effects inside the function. Or functions that implicitly use another input. This idea makes understanding and testing code easier.
2 supporter.