while
loop and Array.prototype.push()
to call the function repeatedly until it returns false
.seed
) and must always return an array with two elements ([value
, nextSeed
]) or false
to terminate.const unfold = (fn, seed) => { let result = [], val = [null, seed]; while ((val = fn(val[1]))) result.push(val[0]); return result; };
var f = n => (n > 50 ? false : [-n, n + 10]);
unfold(f, 10); // [-10, -20, -30, -40, -50]
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