Orbit Analytics Technical Lead Interview Questions and Answers

ext.js is the core library, ext-all.js includes all components, and ext-all-debug.js is for debugging.

• ext.js is the core library that contains the basic functionality of ExtJS

• ext-all.js includes all the components of ExtJS, making it easier to use

• ext-all-debug.js is used for debugging purposes and includes additional information for developers

• ext-all.js and ext-all-debug.js are larger files than ext.js

apply, bind, and call are default methods in JavaScript used to manipulate the value of 'this' keyword.

• apply() method calls a function with a given 'this' value and arguments provided as an array.

• bind() method creates a new function that, when called, has its 'this' keyword set to the provided value.

• call() method calls a function with a given 'this' value and arguments provided individually.

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 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 counter = 0; return function() { counter += 1; return counter; } })();