| comments | Javascript source | Execution result in your current browser |
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| initialize a string | var s=new String("Hello World");
var line="Hello World";
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| length property | document.write(line.length);
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| charAt | document.write("first char: "+line.charAt(0));
document.write("<br/>last char: "+line.charAt(line.length-1));
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| indexOf and lastIndexOf - find a substring position | line="username@mail.egtry.com";
document.write("first occurrence is: "+line.indexOf(".")+"<br/>");
document.write("last occurrence is: "+line.indexOf(".")+"<br/>");
document.write("not found index: "+line.indexOf("##")+"<br/>");
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| substr (length) substring (index) | line="214-123-4567";
document.write("area code is: "+line.substring(0,3)+"<br/>");
document.write("phone number: "+line.substr(4)+"<br/>");
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| toLowerCase and toUpperCase | line="Super 8";
document.write("all uppercase: "+line.toUpperCase()+"<br/>");
document.write("all lowercase: "+line.toLowerCase()+"<br/>");
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| capitalize | line="helpDESK";
document.write("capitalized word: "
+line.substr(0,1).toUpperCase()+line.substr(1).toLowerCase());
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