Hummingbird Web Solutions Software Developer Intern Interview Questions and Answers

Closure in JavaScript is a function that has access to its own scope, as well as the outer scope in which it was defined.

• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and in functional programming.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFun

Class is used to style multiple elements, while ID is used to style a single element.

• Class can be used multiple times in a document, while ID should be unique

• Class is denoted by a period (.), ID is denoted by a hash (#)

• Class can be applied to multiple elements, ID can only be applied to one element