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<!DOCTYPE html> <html lang="en"> <body> <pre id="output"></pre> <script> var map1 = new Map(); map1.set('a', 10); map1.set('b', 20); var displayOutput = ''; map1.forEach (function(value, key) { displayOutput += key + ' - ' + value + '\n'; }); document.getElementById('output').innerHTML += displayOutput; </script> </body> </html>
