JavaScript comments can be used to explain JavaScript code, and to make it more readable. JavaScript comments can also be used to prevent execution, when testing alternative code.

You can use the JavaScript typeof operator to find the type of a JavaScript variable. The typeof operator returns the type of a variable or an expression: Example

JavaScript Comments. Not all JavaScript statements are "executed". Code after double slashes // or between /* and */ is treated as a comment. Comments are ignored, and will not be executed:

JavaScript Statements. JavaScript statements are composed of: Values, Operators, Expressions, Keywords, and Comments. This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":

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Java Comments. Comments can be used to explain Java code, and to make it more readable. It can also be used to prevent execution when testing alternative code.

JavaScript Type Conversion. JavaScript variables can be converted to a new variable and another data type: By the use of a JavaScript function; Automatically by JavaScript itself

W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. The reference contains examples for all properties, methods and events, and is continuously updated according to the latest web standards.

The nodeType property returns the node type, as a number, of the specified node. If the node is an element node, the nodeType property will return 1. If the node is an attribute node, the nodeType property will return 2. If the node is a text node, the nodeType property will return 3. If the node is a comment node, the nodeType property will ...

JavaScript Function Syntax. A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs (same rules as variables). The parentheses may include parameter names separated by commas: (parameter1, parameter2, ...)