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<html><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title></head><body></body></html>const allUnique = (str) => str.split('') .sort((a, b) => a.localeCompare(b)) .map((char, i, arr) => char === arr[i - 1]) .filter(Boolean) .length === 0;console.log(allUnique('Cassidy') === false);console.log(allUnique('cat & dog') === false);console.log(allUnique('cat+dog') === true);
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300px
300px
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