Cavista Technology Interview Questions and Answers

Closure is a function that has access to its parent scope even after the parent function has returned.

• Closure allows for private variables and functions in JavaScript.

• It is created when a function is returned from another function.

• Closures can be used to create factory functions and currying.

• Example: function outer() { let x = 10; return function inner() { console.log(x); } }

• Example: const add = (function () { let coun...read more

var, let, and const are used to declare variables in JavaScript with different scoping rules and mutability.

• var has function-level scope and can be redeclared and reassigned

• let has block-level scope and can be reassigned but not redeclared

• const has block-level scope and cannot be reassigned or redeclared

• Use const for values that should not change, let for values that may change, and var for legacy code or global variab