What is the difference between `Array.prototype.copyWithin()` and `Array.prototype.fill()`?

Explanation

Array.prototype.copyWithin() copies elements within the same array, while Array.prototype.fill() replaces elements with a static value in a range. Both methods mutate the original array, but copyWithin() moves elements while fill() sets them to a specific value.

Key points

copyWithin() moves elements within the same array
fill() replaces elements with a static value in a range
Both methods mutate the original array
copyWithin() does not change the array length
fill() sets elements to a specific value

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