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Question-77, complete the description #807

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Question-77, complete the description #807

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Expand Up @@ -2479,7 +2479,7 @@ function sum(a, b) {

#### Answer: A

A pure function is a function that _always_ returns the same result, if the same arguments are passed.
A pure function is a function that _always_ returns the same result, if the same arguments are passed and cause no side effects.

The `sum` function always returns the same result. If we pass `1` and `2`, it will _always_ return `3` without side effects. If we pass `5` and `10`, it will _always_ return `15`, and so on. This is the definition of a pure function.

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