JavaScript Quiz Questions

JavaScript Fundamentals

• The 'Promise' object in JavaScript is used to handle asynchronous operations, allowing you to write asynchronous code that is easier to read and maintain.

Array Methods

• The unshift() method is used to add a new element at the beginning of an array in JavaScript.
• The push() method is used to add a new element to the end of an array in JavaScript.
• The pop() method is used to remove the last element from an array in JavaScript.

Storage

• The 'localStorage' object in JavaScript is used to store data locally within the user's browser, allowing web applications to store and retrieve data even after the browser has been closed.

APIs and Networking

• The 'fetch' API in JavaScript is used to make HTTP requests and interact with servers, allowing web applications to retrieve and send data.

Operators and Data Types

• The 'typeof' operator in JavaScript is used to determine the data type of a variable or value, returning a string indicating the type of the operand.
• The + operator in JavaScript performs string concatenation when one of the operands is a string.
• The / operator in JavaScript performs arithmetic division, and converts the operands to numbers if necessary.

Strings

• The 'charAt' method in JavaScript is used to retrieve a character at a specific position in a string, with indexing starting from 0.
• The indexOf() method in JavaScript is used to determine if a string contains a specific substring, returning the index of the substring if found, or -1 otherwise.

Variables and Operators

• The 'instanceof' operator in JavaScript is used to test whether an object is an instance of a particular constructor or prototype.
• The delete operator in JavaScript is used to remove a property from an object, but has no effect on variables declared with var.

Dates and Localization

• The "toLocaleString" method in JavaScript is used to convert a date object to a string, using the browser's locale and language settings.
• The Date constructor in JavaScript can be used to convert a string to a date object, by parsing the string in a browser-dependent manner.