Array.prototype.reduce()
to apply the given function to the given array, storing each new result.const reduceSuccessive = (arr, fn, acc) => arr.reduce( (res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res), [acc] );
reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0); // [0, 1, 3, 6, 10, 15, 21]
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