Identifiers
It is the names given to all the components, like variables, methods.
ECMAScript has defined some rules for identifiers.
It is the names given to all the components, like variables, methods.
ECMAScript has defined some rules for identifiers.
- Identifier must start with a letter, dollar sign ($), or underscore (_).
- Identifier cannot start with a number.
- Identifier can contain any combination of letters, a dollar sign, underscore and numbers after the first character.
- Identifier can be of any length.
- Identifier are case-sensitive, for example number and Number are different identifier.
- Identifier cannot contain reserved world or keywords.
example
<!DOCTYPE html>
<html>
<head>
<title>javaScript Identifier</title>
</head>
<body>
<h1>JavaScript Identifier</h1>
<script>
var numberLiteral = 23;
var _floatingpointLiteral = 45.908;
var $_booleanLiteral = true;
var $string_Literal = "This is a String";
var _arrayLiteral = ["array literal 1", "array literal 2", "array literal 3"];
document.write(numberLiteral + "<br />");
document.write(_floatingpointLiteral + "<br />");
document.write($_booleanLiteral + "<br />");
document.write($string_Literal + "<br />");
document.write(_arrayLiteral[0] + "<br />");
document.write(_arrayLiteral[1] + "<br />");
document.write(_arrayLiteral[2] + "<br />");
</script>
</body>
</html>
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