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And a mildly golfed true/false check: str => [...Array(26)].every((e, i) => str.indexOf(String.fromCharCode(97 + i)) >= 0) There should probably be a .toL

by dri_ft 6y ago

And a mildly golfed true/false check: str => [...Array(26)].every((e, i) => str.indexOf(String.fromCharCode(97 + i)) >= 0) There should probably be a .toLowerCase() in there, though.