Is There A Simple Way To Group Js Array Values By Range?

if I have a js array like below, is there a simple way to re-group the array values by range, the logic is based on the range step, the range step is 1, so if the array values are

Solution 1:

You could use Array#reduce for it.

var array = ["1", "2", "3", "5", "6", "9", "12", "13", "14", "15", "16"],
    result = array.reduce(function (r, a, i, aa) {
        r.push(!i || aa[i - 1] - a + 1 ? a : r.pop().split('-')[0] + '-' + a);
        return r;
    }, []);

console.log(result);

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