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Hi I have started www.idontknowjavascript.com purely for educational purpose and want to share my knowledge and learn from you guys. Here I have provided many articles where I have tried explaining topics with simple examples. Also this is a place where we can share our queries, comment, questions etc with others.

I am Himanshu Sharma. I have 5+ years of Software development and IT experience and have worked on domains like CRM , ERP, Banking, Finance and Rail Transportation on various technologies like Javascript, NodeJs, AngularJs, Mongodb, ReactJs, Express Js, Mobile development etc.


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Come Closure in Javascript

What is a closure? If we want to derive a definition,we can say, A closure is a feature of Javascript where inner function has access to the outer (enclosing) function’s variables—scope chain. This scope chains means inner function has: access to its own scope (variables defined between its curly brackets and its parameters),access to the outer function’s variables and parameters, access to the global variables. Now we will look into it in detail. Consider following example
var globalVar = "xyz"; function outerFunc(outerArg) { var outerVar = 'Alex'; function innerFunc(innerArg) { var innerVar = 'Chris'; console.log("globalVar = " + globalVar); console.log("outerArg = " + outerArg); console.log("innerArg = " + innerArg); console.log("outerVar = " + outerVar); console.log("innerVar = " + innerVar); } innerFunc(456); } outerFunc(123); In this example, i…
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Javascript Interview Question and Answer - 1

In this article we are going to discuss 2 javascript interview question and their answers.These questions are highly asked in the Javascript interviews.

Disclaimer: - You might have different solution working with all test cases for both the problems.

So lets discuss the first question.This question is to test your ability in terms javascript object knowledge and your logical thinking.

Q1. You have been given a nested object "Person" which has one of the property as "password".Write a generic function to change the value of all the "password" property to "*****". Object is nested and may contain other object with property "password" and so on. Here is a sample object.

var Person = {
     name: 'Alex',
     age : 40,
    password : 'abc',
    x : {
       name : 'Chris',
       password: 'abcd',
       y : {
          name : 'Mike',
          password: 'abcd',
         },
     }
.
.
}

Before we …
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Javascript Hoisting Interview Question and Answers - 5

In this post,I have tried to cover all the types of possible interview questions and answers on hoisting. If you are not familiar with the hoisting, I would highly recommend you to go to my post on hoisting. Once you are comfortable with the topic, you can attempt these questions. Understanding the type of question will help you to answer. I have provided the hint after each question. All the answers are given at the end of the post.
//Question 1 console.log('bar:', bar) bar = 15 var foo = 1 console.log(foo, bar) var bar Hint: Basics of hoisting //Question 2 var foo = 5 console.log('foo:', foo) var foo; var bar = 10; var bar; console.log('bar:', bar) var baz = 10 var baz = 12 console.log('baz:', baz) Hint: Basics of hoisting //Question 3 function foo() { function bar() { return 5 } return bar() function bar() { return 10 } } console.log(foo()); Hint: Think what happens if two functions wit…
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