Js string manipulation

"test012345".slice(-5); // five last digits return "12345"

"ABC".charCodeAt(0); // return 65 for the first char
"123".split(''); // sting to chars array
String.fromCharCode(65, 66, 67); // return 'ABC'

["1", "4", "5"].every(i => i.match(/\d/i)); // every match