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String in Examples of Javascript 1
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Standards 
Code Result
\b Backspace
\f Form Feed
\n New Line
\r Carriage Return
\t Horizontal Tabulator
\v Vertical Tabulator
Code Result Description
\' ' Single quote
\" " Double quote
\\ \ Backslash

substring() is similar to slice().

The difference is that substring() cannot accept negative indexes.
 

substr() is similar to slice().

The difference is that the second parameter specifies the length of the extracted part.
Examples 
<!DOCTYPE html>
    <html lang="en-US">
        <head>
            <meta charset="UTF-8">
            <title>string</title>
        </head>
        <body>
            
            <script>
              var name=" vidhyaa";
              name=name.trim();
              document.write(name.length+"<br>");//return the length of the string.
              document.write(name.toUpperCase()+"<br>");
              document.write(name.toLowerCase()+"<br>");
              document.write(name.concat("laya")+"<br>"); 
              document.write(name.charAt(2)+"<br>");
              document.write(name.substring(2,5)+"<br>");
              document.write(name.slice(-3,-1)+"<br>");
              document.write(name.substr(-3,1)+"<br>");
              document.write(name.indexOf("d")+"<br>");// returns -1 not exist otherwise index of the first occurrance. index starts with zero.
              document.write(name.lastIndexOf("a")+"<br>");// searching string from reverse.
            </script>
            
        </body>
    </html>
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