JS Array - Slice vs Splice
Slice => copies a slice of the array and returns the copies slice (org. array remains unmutated)
Splice => plucks out(removes) a slice from the array and returns the remaining array, can also be used add elements to the array
For both:
start
Negative index counts back from the end of the array — if start < 0, start + array.length is used.
end
Negative index counts back from the end of the array — if end < 0, end + array.length is used.
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