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In JavaScript, I’ve an object with an array, and a method wich gets a slice of that array and a concatenation with another array.
If that method is run several times in the same function to return always the same value, does the performance will be faster after of the first run (due to the result will be cached in CPU cache)?
Of course no is the only answer would be here. Because the purpose of a function is to take some parameters and return a value. All the parameters might be different each time you call the function and even if they are the same, the result might be different, also event if you call the function and each time it returns the same result, because it might do an action or cause some modifications in other places, caching the result by the parser would be a buggy idea.
Cheers