2023 javascript interview questions मै दोस्तों आपका स्वागत है
2023 javascript interview questions difference between Java & JavaScript से लेकर javascript का syntax और javascript का छोटे बड़े टॉपिक शामिल होगे
Q 1. What is the difference between Java & JavaScript
Q 2. javascript advantage
Versatility and Ubiquity:
Easy to Learn
Interactivity and Rich User Interfaces
Asynchronous Programming:
Large and Active Community:
Cross-platform Compatibility:
Open Source and Free:
Real-time Communication:
Functional Programming Support:
Cross-platform Mobile App Development:
Server-side Development:
Q 3. javascript disadvantage
Browser Compatibility Issues:
Security Concerns
Performance Challenges:
No Multithreading Support:
Debugging Complexities:
Code Visibility:
Lack of Type Safety
Maintainability of Large Projects:
SEO Limitations:
<!DOCTYPE html>
<html>
<head>
<title>Hello, World! Example</title>
</head>
<body>
<!-- A script tag to include the JavaScript code -->
<script>
// JavaScript code
console.log("Hello, World!");
</script>
</body>
</html>
Q 5. JavaScript case sensitive language or not
Yes, JavaScript is a case-sensitive language
example :- variables named myVariable, myvariable, and MYVARIABLE are considered three distinct variables in JavaScript
// Case-sensitive variable names
let myVariable = "Hello";
let myvariable = "World";
console.log(myVariable); // Output: "Hello"
console.log(myvariable); // Output: "World"
// Case-sensitive function names
function myFunction()
{
console.log("This is my function.");
}
function myfunction() {
console.log("This is another function.");
}
myFunction(); // Output: "This is my function."
myfunction(); // Output: "This is another function."
Q 6. what is bom ?
BOM stands for Browser Object Model. It is a set of APIs (Application Programming Interfaces) provided by web browsers to interact with and manipulate the browser window or tab.
Window Object:
Document Object:
Navigator Object.
Screen Object:
example:-<!DOCTYPE html>
<html>
<head>
<title>BOM Example</title>
</head>
<body>
<script>
// Using the BOM to display an alert box
window.alert("Hello, BOM!");
</script>
</body>
</html>
DOM stands for Document Object Model. It is a programming interface provided by web browsers that allows JavaScript and other scripting languages to interact with the content and structure of HTML and XML documents.
Tree Structure:
Access and Manipulation:
Event Handling:.
Cross-platform Compatibility:
create objects in JavaScript
A) Object Literal:
const person = {
name: 'John',
age: 30,
gender: 'male',
};
B) Object Constructor Function:
function Person(name, age, gender)
{
this.name = name;
this.age = age;
this.gender = gender;
}
const person = new Person('John', 30, 'male');
C) Class Syntax (ES6):
class Person
{
constructor(name, age, gender)
{
this.name = name;
this.age = age;
this.gender = gender;
}
}
D) Object.create():
const personPrototype =
{
greet: function()
{
return `Hello, my name is ${this.name}.`;
}
};
const person = Object.create(personPrototype);
person.name = 'John';
person.age = 30;
person.gender = 'male';
console.log(person.greet()); // Output: "Hello, my name is John."
E) Factory Function:
function createPerson(name, age, gender)
{
return
{
name: name,
age: age,
gender: gender,
};
}
const person1 = createPerson('John', 30, 'male');
const person2 = createPerson('Alice', 25, 'female');
Q 9. create array in javascript
A) Array Literal Syntax:
const fruits = ['apple', 'orange', 'banana'];
B) Array Constructor:
const numbers = new Array(1, 2, 3, 4, 5);
C) Accessing Elements:
const fruits = ['apple', 'orange', 'banana'];
console.log(fruits[0]); // Output: 'apple'
console.log(fruits[1]); // Output: 'orange'
D) Modifying Elements:
const numbers = [1, 2, 3, 4, 5];
numbers[2] = 10;
console.log(numbers); // Output: [1, 2, 10, 4, 5]
E) Array Methods:
const numbers = [1, 2, 3];
numbers.push(4); // [1, 2, 3, 4]
numbers.pop(); // [1, 2, 3]
F) Array Length:
const fruits = ['apple', 'orange', 'banana'];
console.log(fruits.length); // Output: 3
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