Counter factory

CoreJavaScript

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Problem

Write makeCounter(start) which returns a function. Each call to that function increments an internal count by 1 and returns the new value. start defaults to 0, so the first call returns start + 1. Two counters must be fully independent. const next = makeCounter(); next() → 1; next() → 2 const fromTen = makeCounter(10); fromTen() → 11

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