But the input to the function is the same. The calculation differs because of coercion that happens as a feature if JS. The inputs themselves are unchanged. The input in this case is an object with a single method.
The input is an object, but it's value upon coercion to a number differs on each coercion. In a very strict sense, such a simple function could be considered impure. To make it strictly pure in JS, you could add a bunch of code checking types etc.
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But the input to the function is the same. The calculation differs because of coercion that happens as a feature if JS. The inputs themselves are unchanged. The input in this case is an object with a single method.
In input of function is function that keeps changes its value, then that function can not be considered as pure function, right ?
The input is an object, but it's value upon coercion to a number differs on each coercion. In a very strict sense, such a simple function could be considered impure. To make it strictly pure in JS, you could add a bunch of code checking types etc.