Multiple Choice Questions
Consider the following code: var x = 2; var y = 6; var z = -3; Which of the following line of code will update the stored value of the variable y to 3?
Which of the following statement sets a function called myHandler to be called when myButton is clicked?
What causes a loop to be infinite?
What value is stored in the variable x after the following lines of code are executed? var x = 3; x*=2;
typeof -34.7
typeof "-34.7"
var myVar = "23"; What is the data type of the variable myVar?
typeof "390" What is the result of the this statement?
JavaScript was created by Google in 2005 for the Gmail application that needed more interactivity
JavaScript statements end with ________.
Consider the variable: var greeting = "Hello"; greeting += "John";What value is stored in the greeting variable after the 2nd line of code?
Consider the following code: var x = 2; var y = 6; var z = -3; What is the datatype of the variable **z**?
Which message will be displayed on the document when the following code is executed? var num = 40; if(num > 60) { document.write("zone 1"); } else if(num > 25) { document.write("zone 2"); } else{ document.write("zone 3"); }
Which JavaScript statement creates a new list item element and stores it in a new variable named listItem?
What output will be displayed on the document when the following loop completes? for(x = 0; x < 4; x++){ document.write(x + " "); }
What is an infinite loop?
var mySection = document.getElementById("mySection"); var special = mySection.getElementsByClassName("special");What will the variable special contain after this code is executed?
What is the result of the following statement? typeof 340.2
Which of the following for-loop declarations creates a loop that will execute 4 times?
Assume that a variable has been declared and initialized with the following statement: var count = 4;Which of the following statements updates the variable with the value 24?
Which of the following statement would return a collection of elements that have the class "special"?
Consider the following object: var book = { title: "Romeo and Juliet", author: "William Shakespeare", publishDate: 1597 }; Considering the book object above, author is a ________ of the book object.
Which of the following statements changes the CSS background-color of an element to "green"?
Consider the following code: var book = { title: "Romeo and Juliet", authorFirstName: "William", authorLastName: "Shakespeare", publishDate: 1597 }; What line of code logs the value of the title property to the console?
var x = 25; var y = 12; var z = x < y;What is the data type of the variable z above?
Which line of code creates a variable named language that holds that value "JavaScript"?
Which message will be displayed on the document when the following code is executed? var x = 3; var y = 8; if(x % 2 == 1 && y > 6) { document.write("This test passed" ); }else{ document.write("This test failed"); }
Which statement creates an array named colors and stores 4 elements?
Which alert message(s) will be displayed when the following code runs? var num = 42; if(num <= 30) { document.write("Alert message #1"); } else{ document.write("Alert message #2"); }
Which message will be displayed on the document when the following code is executed? var num = 24; if(num > 82) { document.write("zone 1"); } else if(num >= 43) { document.write("zone 2"); } else{ document.write("zone 3"); }
A complete line of JavaScript code that can be executed by the computer is called a(n) ________.
A JavaScript variable that originally stored a number can later store a string value.
In order to write JavaScript code that is embedded in an HTML file, your JavaScript code belongs ________.
Which of the following statements declares a variable named highScore?
Which of these is a JavaScript array?
Which of the following statements changes the href attribute of an element to "www.microsoft.com"?
A ________ is a container that can store a value in your program that can be accessed or modified at a later point.
Consider the code: var greeting = "Hello"; var contact = { firstName: "Jane", lastName: "Doe", age: 35 }; What line of code update the greeting variable to store the value "Hello Jane"?
In JavaScript, in order to change the content of an HTML document or the CSS style of HTML elements, we use:
Which message will be displayed on the document when the following code is executed? var x = 3; var y = 8; if(x < 5 && y > 6) { document.write("This test passed"); } else{ document.write("This test failed"); }
How can a function return a value?
What is the primary role of JavaScript?
Which of the following statements defines a function named increment that returns a value and defines a parameter?
var language = "JavaScript"; The data type of the language variable above is:
Which of the following keywords is used to define a function?
Which of the following does not output information to the user via the webpage?
A JavaScript script will always be executed after the HTML page finishes loading.
Which of the following statements declares a variable named score?
Which of the following lines of code produces the value "William Shakespeare"?
var x = 25; var y = 12; var z = x < y;What value is stored in the variable z above?
Which of the following statements invokes a function named myFunction that has no parameters?
What value is stored in the variable x after the following lines of code are executed? var x = 9; var y = 3; var z = x%y;
Consider the following code: var book = { title: "Romeo and Juliet", authorFirstName: "William", authorLastName: "Shakespeare", publishDate: 1597 }; The code above creates a(n) ________ with the identifier book.
Which of the following statements invokes a function named myFunction that accepts a numeric parameter?
Which of the following statements calls a function, giveMeANumber, and passes the number 4 as a parameter?
var x = 4; var y = 9; var z = x < y; What is the data type of the variable z above?
Which of the following statements declares a (non-global) variable named myNum and assigns it a value of 24?
JavaScript can only run in a browser (It cannot run in other environments).
Which statement retrieves the element "d" from the array myArray? var myArray = ["a", "b", "c", "d", "e"];
What belongs immediately after the if keyword in an if statement, within the parentheses? if ( )
What will the value of x be when the following while loop stops executing? var x = 4; while(x > 0) { alert("Hello "); x--; }
Which of the following can be used to modify the text within a paragraph?
var x = 34; var y = 10; var z = x%y;What value is stored in the variable z after the following lines of code are executed?
typeof "Hello, world"
Which JavaScript statement uses the document object to get a list of all of the h1 elements on a page and stores the collection in a variable named headings.
JavaScript is a(n) ________.
Which of the following statements stores a value returned from a function?
A(n) ________ can hold a collection of named values, known as properties.
Which of the following are used to create a variable and assign it a value?
Which JavaScript statement creates a new list item element and stores it in a new variable named listItem.
var x = 4; var y = 9; var z = x < y; What value is stored in the variable z above?
Consider the following object: var book = { title: "Romeo and Juliet", author: "William Shakespeare", publishDate: 1597 }; Considering the book object above, which line of code will write the publish date of the book object to the browser console?
JavaScript code is case sensitive.
Which statement retrieves the element with the value 32 from the array numbers? var numbers = [1, 3, 12, 42, 32, 4];
JavaScript allows you to develop webpages that are ________. This means the webpage's content changes based on conditions and interactions.
Which alert message(s) will be displayed when the following code runs? var num = 35; if(num <= 30) { document.write("Alert message #1"); } else{ document.write("Alert message #2"); }