SaaS Labs SDE Interview Questions and Answers

Closures are functions that have access to variables from their containing scope even after the scope has closed.

• Closures allow functions to 'remember' the environment in which they were created

• They can access variables from their outer function even after the outer function has finished executing

• Closures are commonly used in event handlers and callbacks

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.

• Variables and functions are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations are hoisted before variable declarations.