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  • argument

    Value given to a method.

    Boolean data types

    Variables that contain logical data that can be one of two values, such as True/False or Yes/No

    built-in objects

    Values that are common to a browser (arrays, dates, strings, etc) which neither depend on nor belong to another object.


    To join or link together - in JavaScript the symbol for concatenation is the plus sign.


    An HTML tag that identifies a section of HTML code using the id attribute so content of the tag can be set or defined by the use of the innerHTML property.

    data type

    JavaScript has four: numeric, string, date, or Boolean.

    date data types

    Variables that contain a date and time.


    A programming language that responds to events, such as a Web page loading or a user clicking a Submit button

    event handler

    JavaScript's way to associate an action with a function.


    JavaScript code that is written to perform tasks repeatedly.


    The variable is available for use anywhere inside the HTML file Web page. Must be declared in the <script> section before any of the user-defined functions.


    An event-driven, object-based programming language that provides various types of functionality to Web pages, such as the ability to interact with the user.


    A reserved word with special meaning in a programming language.


    `The variable's value is available only in the function in which it is defined.

    loosely typed

    JavaScript variables that do not have to be assigned as initial specific data type as in other programming languages.


    Actions that an object can perform.

    numeric data types

    Variables that hold numbers


    A scripting language that uses built-in objects that belong to the browser.

    object instance variable

    JavaScript statement which uses the new keyword and assigns the built-in object to a variable.


    Attributes that describe an object's characteristics.

    relative address

    Location of a byte in a string of bytes, as defined by its position relative to the first byte in that string.

    reserved word

    A keyword with a special meaning in a programming language.

    string data types

    Variables that hold characters or a combination of letters, numbers or symbols.

    user-defined function

    JavaScript code written by a Web developer to perform a particular task.

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