JavaScript Fundamentals Quiz

exec() is a method of RegExp objects, not a global built-in function. parseInt(), eval(), and parseFloat() are all global functions available without any object prefix. The exec() method must be called on a RegExp instance and returns match information for a regular expression test.

Math is a built-in JavaScript object providing mathematical constants and functions like Math.random(), Math.floor(), Math.PI, etc. Password, Link, and Hidden are not built-in JavaScript objects - they were DOM form element objects in older browser specifications but are not part of core JavaScript.

In the context of client-side JavaScript (Netscape era), 'external objects' referred to browser-specific interfaces for form elements. Checkbox was an external object representing HTML checkbox elements in the forms collection. Date is a built-in object, while Option and Layer represent other browser/DOM interfaces.

'this' is a keyword that refers to the current execution context, not an operator. The new operator creates object instances, delete removes properties, and typeof returns a string indicating the operand's type. These are all JavaScript operators, but 'this' is a contextual keyword.

LiveConnect was the technology that enabled JavaScript to communicate with Java applets, allowing JavaScript to call Java methods and access Java properties. LiveWire and LiveWire Pro were server-side JavaScript technologies. The Java console is a debugging tool, not an integration mechanism.

Before JavaScript 1.2's enhanced String.replace(), you could remove characters using two approaches: 1) iterate through the string building a new string without 'x', or 2) split on 'x' and join the array with empty string. Both methods work, though split/join is more concise.

The MAYSCRIPT attribute is an HTML attribute (not a JavaScript feature) used in tags to explicitly grant Java applets permission to access JavaScript objects and functions. This is a security feature - applets cannot access JavaScript unless this attribute is present. CODE, PARAM, and CODEBASE are other applet attributes.

When pattern.exec() matches, it returns an array where index [0] contains the complete matched string. The pattern /(\w+)(\d).(\d)/ matches 'JavaScript1.2' entirely, so outCome[0] is 'JavaScript1.2'. Subsequent indices contain captured groups: [1]='JavaScript', [2]='1', [3]='2'.

External scripts are referenced via the src attribute in

When JavaScript is disabled in the browser, no JavaScript code can execute, including event handlers. This is typically a browser setting that users can configure. The presence of stylesheets, local execution, or other events being processed does not prevent JavaScript execution.