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99 Cards in this Set
- Front
- Back
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A ____ error is a flaw in a program's design that prevents the program from running as you anticipate. |
logic |
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A ____ error occurs when the interpreter fails to recognize code. |
syntax |
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A ____ error occurs when the JavaScript interpreter encounters a problem while a program is executing. |
run-time |
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After you evaluate code for exceptions, you can use a ____ statement to perform cleanup or necessary tasks. |
finally
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After you throw an error, you use a ____ statement to handle the error.Select one:
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catch
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An infinite loop is an example of a(n) ____ error.
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logic
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Mark 1.00 out of 1.00Flag questionQuestion textThe console.log() debugging method results in messages ____.
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displayed in the browser console
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The debugging tools built into modern browsers are especially useful in tracking down ____.
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logic errors
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The window.alert() debugging method results in messages ____.
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displayed in dialog boxes
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The ____ is the ordered list maintained by a JavaScript processor containing all the procedures that have been called but have not yet finished processing.
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call stack
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When using the console.log() method to trace bugs, it can be helpful to use a ____ program.
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driver
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Which of the following JavaScript statements requests that processors remove some features from the language and require more stringent syntax for other features?
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"use strict";
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Which of the following JavaScript statements works like a breakpoint?
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debugger;
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Writing values directly to the console is known as ____.
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logging
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You enclose code that may contain an exception in a ____ statement.
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try
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You use a ____ statement within a try block to specify an error message.
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throw
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____ allows programs to handle errors as they occur in the execution of a program.
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Exception handling
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____ is the temporary suspension of program execution so you can monitor values and trace program execution.
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Break mode
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A program's ____ is the order in which various parts of the program run, or execute.
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logic
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The rules of a programming language are known as its ____.
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syntax
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A set of connected nodes that are not part of a document is known as a(n) ____.
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document fragment
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In order to make a window the active window, you use the ____ method of the Window object.
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focus()
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The DOM hierarchy is also known as ____.
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the DOM tree
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The History object contains a single property, the ____ property, which contains the specific number of documents that have been opened during the current browser session.
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length
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The ____ method is used in JavaScript to execute code after a specific amount of time has elapsed.
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setTimeout()
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The ____ method is used to cancel a setTimeout() method before its code executes.
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clearTimeout()
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The ____ method is used to clear a setInterval() method call.
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clearInterval()
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The ____ method repeatedly executes the same code after being called only once.
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setInterval()
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The ____ object allows you to change to a new web page from within JavaScript code.
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Location
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The ____ object is used to obtain information about the current web browser.
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Navigator
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When you open a new web browser window, you can customize its appearance using the ____ argument of thewindow.open() method.
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options
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Which is the correct way to reference the CSS font-family property in JavaScript when using dot notation?
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fontFamily
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Which is the correct way to reference the href attribute of the element with the id value homeLink?
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document.getElementById("homeLink").href
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Which method adds a node to a parent node before one or more existing child nodes?
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insertBefore()
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Which method does NOT return a node list or HTML collection?
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getElementById()
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Which method returns a single element?
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querySelector()
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Which method returns all h1 elements in a document?
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getElementsByTagName("h1")
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Which method returns all elements in a document that match the selector p figure img?
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querySelectorAll("p figure img")
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Which method returns the element created by the HTML tag pair ?
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getElementsByClassName("first")
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Which results in a node that exists independently of the DOM tree?
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createElement()
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For any fields that require numeric values, you can use JavaScript's built-in ____ function to determine whether a user actually entered a number.
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isNaN()
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In general, modern browsers display validation feedback after the ____ event is triggered by a form.
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submit
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In modern browsers, which attribute of an input element prevents the form from being submitted if the field is left blank?
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novalidate
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Instead of document.getElementsByTagName("form")[0], you could use the code
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document.forms[0]
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Many aspects of the way browsers present browser-based validation feedback are customizable through the properties and methods of the ____.
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constraint validation API
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The ____ event fires when a form is submitted.
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submit
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To check a group of fields and trigger an error message if any of them is empty, you use a(n) ____ statement.
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loop
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To check if an option button is selected, you access the value of its ____ property.
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checked
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To display no default value on a selection list, you set its ____ property to -1.
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selectedIndex
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Use of the ____ attribute of the form element is not allowed in the strict DTD for XHTML.
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name
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Validation errors found by modern browsers are reported in ____.
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bubbles
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What element property would you use when copying the contents of one text field to another text field?
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value
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When a control's value is found to be invalid during constraint validation, the ____ event is triggered.
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invalid
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Which attribute enhances usability in modern browsers?
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placeholder
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Which attribute toggles off validation of a form when added to the opening tag?
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novalidate
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Which type value for the input element triggers validation in modern browsers?
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number
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You can use the CSS ____ pseudo-classes to change the properties of form elements based on their validity status.
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:invalid and :valid
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You create an empty document fragment using the ____ method.
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createDocumentFragment()
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You use the ____ method on an object to block the action normally associated with an event.
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preventDefault()
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A(n) ____ array is an array whose elements are referred to with an alphanumeric key instead of an index number.
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associative
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A(n) ____ function is a function that is used as the basis for a custom object.
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constructor
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A(n) ____ is an object that has been created from an existing class.
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instance
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Objects are also called ____.
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components
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The code (methods and statements) and data (variables and constants) contained in an encapsulated object are accessed through a(n) ____.
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interface
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The term ____ refers to information contained within variables or other types of storage structures.
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data
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The ____ class contains methods and properties for manipulating the date and time.
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Date
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The ____ class contains methods and properties for performing mathematical calculations in your programs.
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Math
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The ____ class contains methods for manipulating numbers and properties that contain static values representing some of the numeric limitations in the JavaScript language.
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Number
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The ____ property is a built-in property that specifies the constructor from which an object was instantiated.
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prototype
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To add a property to a constructor function, you must add a statement to the function body that uses the ____ keyword.
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this
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To delete a specific property in a custom object, you use the ____ operator.
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delete
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To execute the same statement or command block for all the properties within a custom object, you can use the ____ statement.
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for/in
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When creating an object using a literal, you separate multiple property-value pairs with ____.
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commas
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When working with a date, JavaScript stores the month as a ____.
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value from 0-11
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Which class requires you to use a constructor?
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Date
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Which method of the Math object rounds a value to the next lowest integer?
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floor()
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Which Number class method can you use to convert a number to a string that is formatted with local numeric formatting style?
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toLocaleString()
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You can create a function that will be used as an object method by referring to any object properties it contains with the ____ reference.
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this
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____ refers to cleaning up, or reclaiming, memory that is reserved by a program.
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Garbage collection
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A pattern that matches the beginning or end of a line is called a(n) ____.
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^ anchor |
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Characters contained in a set of parentheses within a regular expression are referred to as a subexpression or ____.
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subpattern
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Regular expression patterns consist of literal characters and ____.
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metacharacters
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The fromCharCode() method is called a ____ method because it is not used as a method of any string objects (which can be literal strings or variables) in your scripts.
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static
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The JavaScript String class includes the ____ method, which creates a new string by combining strings that are passed as arguments.
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concat()
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The String class ____ property returns the number of characters in a string.
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length
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The ____ method adds one or more elements to the end of an array.
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push()
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The ____ method constructs a text string from Unicode character codes that are passed as arguments.
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fromCharCode()
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The ____ method converts a text string to lowercase.
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toLowerCase()
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The ____ method converts a text string to uppercase.
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toUpperCase()
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The ____ method of the String class returns the position number in a string of the first character in the argument.
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indexOf()
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The ____ method removes and returns the first element from the beginning of an array.
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shift()
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The ____ method returns the position number in a string of the first instance of the first character in the pattern argument.
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search(pattern)
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The ____ object contains methods and properties for working with regular expressions in JavaScript.
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RegExp
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To allow a string to contain an alternate set of substrings, you separate the strings in a regular expression pattern with the ____ metacharacter.
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To convert a JavaScript object to a JSON string, you use the ____ method.
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stringify()
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To manipulate arrays in your scripts, you use the methods and length property of the ____ class.
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Array
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To sort elements of an array alphabetically, you use the ____ method.
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sort()
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You use the ____ method of the String class to split a string into an indexed array.
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split()
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You use ____ classes in regular expressions to treat multiple characters as a single item.
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character
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