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7.  The toLowerCase() Method: The toLowerCase() method converts all characters in a string to lowercase.
              Example 37: To demonstrate the use of toLowerCase method

                 <!DOCTYPE HTML>
                 <HTML>

                 <HEAD>
                 <TITLE>toLowerCase() Method</TITLE>
                 </HEAD>
                 <BODY>
                 <H2>The toLowerCase() Method</H2>

                 <P>The toLowerCase() method converts text to lowercase.</P>
                 <P id="demo1"></P>
                 <SCRIPT>

                 var text = "HELLO WORLD";
                 document.getElementById("demo1").innerHTML = text.toLowerCase();
                 </SCRIPT>
                 </BODY>
                 </HTML>
              Output:

















              8.  The concat() Method: The concat() method joins two or more strings together.

              Example 38: To demonstrate the use of concat method
                 <!DOCTYPE HTML>

                 <HTML>
                 <HEAD>
                 <TITLE>concat() Method</TITLE>

                 </HEAD>
                 <BODY>
                 <H2>The concat() Method</H2>
                 <P>The concat() method joins two or more strings.</P>
                 <P id="demo1"></P>

                 <SCRIPT>
                 var text1 = "Hello";
                 var text2 = "World";
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