3..6), the range is inclusive (3, 4, 5, 6); with three dots (3...6), the range excludes the end (3, 4, 5). Slices indices have useful defaults. An omitted first index defaults to zero and an omitted second index defaults to the size of the array.numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
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start = numbers[0..2]
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middle = numbers[3...-2]
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end = numbers[-2..]
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copy = numbers[..]​var copy, end, middle, numbers, start;
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numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
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start = numbers.slice(0, 3);
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middle = numbers.slice(3, -2);
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end = numbers.slice(-2);
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copy = numbers.slice(0);​splicing it.numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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numbers[3..6] = [-3, -4, -5, -6]​var numbers, ref,
splice = [].splice;
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numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
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splice.apply(numbers, [3, 4].concat(ref = [-3, -4, -5, -6])), ref;Note that JavaScript strings are immutable, and can’t be spliced.