General Interview Questions on JavaScript

• What is JavaScript?
• Name some of the JavaScript features.
• What are the advantages of using JavaScript?
• What are disadvantages of using JavaScript?
• Is JavaScript a case-sensitive language?
• How can you create an Object in JavaScript?
• How can you read properties of an Object in JavaScript?
• How can you create an Array in JavaScript?
• How to read elements of an array in JavaScript?
• What is a named function in JavaScript? How to define a named function?
• How many types of functions JavaScript supports?
• How to define a anonymous function?
• Can you assign a anonymous function to a variable?
• Can you pass a anonymous function as an argument to another function?
• What is arguments object in JavaScript?
• How can you get the type of arguments passed to a function?
• How can you get the total number of arguments passed to a function?
• How can you get the reference of a caller function inside a function?
• What is the purpose of 'this' operator in JavaScript?
• What are the valid scopes of a variable in JavaScript?
• Which type of variable among global and local, takes precedence over other if names are same?
• What is callback?
• What is closure?
• Give an example of closure?
• Which built-in method returns the character at the specified index?
• Which built-in method combines the text of two strings and returns a new string?
• Which built-in method calls a function for each element in the array?
• Which built-in method returns the index within the calling String object of the first occurrence of the specified value?
• Which built-in method returns the length of the string?
• Which built-in method removes the last element from an array and returns that element?
• Which built-in method adds one or more elements to the end of an array and returns the new length of the array?
• Which built-in method reverses the order of the elements of an array?
• Which built-in method sorts the elements of an array?
• Which built-in method returns the characters in a string beginning at the specified location?
• Which built-in method returns the calling string value converted to lower case?
• Which built-in method returns the calling string value converted to upper case?
• Which built-in method returns the string representation of the number's value?
• What are the variable naming conventions in JavaScript?
• How typeof operator works?
• What typeof returns for a null value?
• Can you access Cookie using javascript?
• How to create a Cookie using JavaScript?
• How to read a Cookie using JavaScript?
• How to delete a Cookie using JavaScript?
• How to redirect a url using JavaScript?
• How to print a web page using javascript?
• What is Date object in JavaScript?
• What is Number object in JavaScript?
• How to handle exceptions in JavaScript?
• What is purpose of onError event handler in JavaScript?