Determine if a string has all unique characters: Difference between revisions

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(→‎{{header|JavaScript}}: Added a variation in terms of sorting and grouping.)
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Or, an alternative to sorting and grouping:
Or, as an alternative to sorting and grouping:
<lang javascript>(() => {
<lang javascript>(() => {
'use strict';
'use strict';
Retrieved from "https://rosettacode.org/wiki/Determine_if_a_string_has_all_unique_characters"