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const st = new Set(['typescript', 'javascript', 'node.js', 'c++', 'c']); const newset = new Set(); st.forEach(value => { newset.add(value.toUpperCase()); }); console.log(newset); /* run: {"TYPESCRIPT", "JAVASCRIPT", "NODE.JS", "C++", "C"} */
const st = new Set(['typescript', 'javascript', 'node.js', 'c++', 'c']); const newset = new Set(Array.from(st).map(value => value.toUpperCase())); console.log(newset); /* run: {"TYPESCRIPT", "JAVASCRIPT", "NODE.JS", "C++", "C"} */