FREE CIW JavaScript Specialist Questions and Answers
Linda wishes to delete some of the cookies that her website's visitors have received from her server. What is the most effective method for her to complete this task?
Changing the date field of a cookie to a date in the past is the most common and effective way to clear cookies that have been set by a web server. When a cookie expires, the browser automatically removes it from the client's machine.
What phrase describes the method of moving variables from one data type to another in JavaScript?
In JavaScript, casting is the process of converting a value from one data type to another. It allows you to change the type of a variable or value to facilitate operations or comparisons that require a different data type.
Which of the following is true for the prototype property?
In JavaScript, when a variable is declared but has not yet been assigned a value, its initial value is undefined. The undefined value represents the absence of a value or the lack of an assigned value.
In JavaScript, William is creating a constructor. When referring to the properties and methods in his object parameters and functions, he uses the phrase "this." Why?
In JavaScript, when writing a constructor function, the this keyword is used to refer to the object being constructed. Within the constructor, this allows you to access and assign values to the object's properties and define its methods.
Which option best exemplifies the proper syntax for declaring a variable?
The statement var lastName; demonstrates the correct syntax for declaring a variable in JavaScript using the var keyword.
In JavaScript, you can declare variables using three different keywords: var, let, and const. The var keyword is used to declare a variable that has function scope or global scope, depending on where it is declared.
Which method of the String object would you employ for composing an intricate mathematical formula with powers in JavaScript, such as "E=MC2"?
You can achieve superscript formatting in HTML using the tag to display text as a superscript.
What kind of variable data type is a variable that has not yet been given a value?
In JavaScript, the term "referrer" refers to a string value that represents the URL of the document from which the current document was accessed. It provides information about the previous or referring URL that led to the current page.