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Strings are, as we know, absolutely everywhere and JavaScript strings are used for storing and manipulating text.
Use the following useful and verified links to learn more about strings and string manipulation in JavaScript
https://www.w3schools.com/js/js_strings.asp
https://www.homeandlearn.co.uk/javascript/javascript_strings_case.html
https://www.tutorialrepublic.com/javascript-tutorial/javascript-strings.php