Showing Topics for "javascript"

Arrow Function in JavaScript

Filed under: JavaScript

In this post, we are going to show you arrow function. Watch the below example carefully.<!DOCTYPE html><html><body><h1>JavaScript Functions</h1><h2>The Arrow Function</h2><p>This example shows the syntax of an Arrow Function, and how to use it.&l  ......

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Make a Simple Contact List in JavaScript and Fetch the Number by Name

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Here we have developed one contact list. Which is an array of objects. When any user want to get the contact no. of anybody he is just to pass the value in a function findProp(). findProp(firstValue, secondValue){} this function takes two values firstValue is the name of person of whose yo  ......

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How to Iterate an array elements using For Loop in JavaScript

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In this post, you will see how you can iterate elements of an array in javascript.Note: here we have an array of numbers.We can find the number of elements in this array by using array.length i.e 6. Now we will run for loop six times to print all the elements.All of you know that array starts w  ......

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Make an array of odd numbers using For Loop in JavaScript

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In this post we will see how to make an array of odd numbers using for loop and while loop. We have initialized a blank array with name arr.Code:<!DOCTYPE html><html lang="en"><head>   <meta charset="UTF-8">   <meta name="viewport" content="width=d  ......

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For Loop Iteration In JavaScript

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In this example, we will see for loop iteration. We have taken one blank array. We will push the values in this array using for loop. Below is the complete example of this action.<!DOCTYPE html><html lang="en"><head>   <meta charset="UTF-8">   <meta nam  ......

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While Loop example in JavaScript

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In this post we will see while loop in JavaScript. While loop keep working until the condition is true. As soon as the condition is false it stops.For example we have taken one array here and we will push the values in this array with the help of while loop.<!DOCTYPE html><html lang="en">  ......

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Write a program to Find the Perimeter of a Rectangle in JavaScript

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Create a function that takes length and width and finds the perimeter of a rectangle. ExamplesfindPerimeter(6, 7) ➞ 26findPerimeter(20, 10) ➞ 60findPerimeter(2, 9) ➞ 22 Note: we will make a function findPerimeter which will take two parameters i.e height and width of rectangle. To ca  ......

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Return the Remainder from Two Numbers in JavaScript

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There is a single operator in JavaScript, capable of providing the remainder of a division operation. Two numbers are passed as parameters. The first parameter divided by the second parameter will have a remainder, possibly zero. Return that value. Examplesremainder(1, 3) ➞ 1remainder(3, 4) �  ......

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Write a code to find Maximum Edge of a Triangle in JavaScript

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Create a function that finds the maximum range of a triangle's third edge, where the side lengths are all integers. Examples:nextEdge(8, 10) ➞ 17nextEdge(5, 7) ➞ 11nextEdge(9, 2) ➞ 10 Notes:We will use this algorithm to find the maximum range of a triangle's third edge(side1 + side2)  ......

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Convert Hours into Seconds in JavaScript

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Write a function that converts hours into seconds. Examples:howManySeconds(2) ➞ 7200howManySeconds(10) ➞ 36000howManySeconds(24) ➞ 86400Notes:   60 seconds in a minute, 60 minutes in an hour <script>function howManySeconds(hour){var seconds = hour * 60 * 60 *;} v  ......

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Power Calculator in JavaScript

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Create a function that takes voltage and current and returns the calculated power.Examples:circuitPower(230, 10) ➞ 2300circuitPower(110, 3) ➞ 330circuitPower(480, 20) ➞ 9600Notes:Requires basic calculation of electrical circuits. Power = voltage * current; We will use this calculation in   ......

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Return the First Element in an Array in JavaScript

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Create a function that takes an array containing only numbers and return the first element.Examples:getFirstValue([1, 2, 3]) ➞ 1

getFirstValue([80, 5, 100]) ➞ 80getFirstValue([-500, 0, 50]) ➞ -500Notes:The first element in an array always has an index of 0.Code: <script>function   ......

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Write a code to print Cubes of any number in JavaScript

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In this program, we will make a function cubes(number) which will take number as parameter and will return cube of that number.cubes(3) ➞ 27
cubes(5) ➞ 125
cubes(10) ➞ 1000<script>function cubes(number){return number ** 3; //** means power }</script>

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Convert Age to Days in JavaScript

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Create a function that takes the age in years and returns the age in days.Examples:calcAge(65) ➞ 23725

calcAge(0) ➞ 0

calcAge(20) ➞ 7300 Notes:Use 365 days as the length of a year for this challenge.Ignore leap years and days between last birthday and now.Expect only positive intege  ......

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Write a program in JavaScript to find the Area of Triangle

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Write a function that takes the base and height of a triangle and return its area.Examples:triArea(3, 2) ➞ 3

triArea(7, 4) ➞ 14

triArea(10, 10) ➞ 50 We will make a function triArea(base, height) which will take two values as parametersNotes:The area of a triangle is: (base * height)  ......

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Return the Next Number from the Integer Passed in JavaScript

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Create a function that takes a number as an argument, increments the number by +1 and returns the result.Examples:addition(0) ➞ 1

addition(9) ➞ 10

addition(-3) ➞ -2 code: <script>function addition(num){return num+1;} addition(0) // output 1addition(9) // output 10add

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Convert Minutes into Seconds in JavaScript

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Write a function that takes an integer minutes and converts it to seconds.Examples:convert(5) ➞ 300

convert(3) ➞ 180

convert(2) ➞ 120 Code<script>function convert(minutes){return minutes * 60;  //1 minutes equals to 60 seconds.}convert(5) // output 300convert(3) // output

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Return the Sum of Two Numbers in JavaScript

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Create a function that takes two numbers as arguments and returns their sum.Examplesaddition(3, 2) ➞ 5

addition(-3, -6) ➞ -9

addition(7, 3) ➞ 10 Code: <script>function addition(a, b){return a+b;} addition(3, 2); //output 5addition(-3, -6); //output -9addition(7, 3);

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What are the types of errors in javascript?

Filed under: JavaScript Interview Questions

There are two types of errors in javascript.Syntax error: Syntax errors are mistakes or spelling problems in the code that cause the program to not execute at all or to stop running halfway through. Error messages are usually supplied as well.Logical error: Reasoning mistakes occur when the syntax i  ......

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What is DOM?

Filed under: JavaScript Interview Questions

DOM stands for Document Object Model.  DOM is a programming interface for HTML and XML documents.When the browser tries to render an HTML document, it creates an object based on the HTML document called DOM. Using this DOM, we can manipulate or change various elements inside the HTML document.

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Which method is used to retrieve a character from a certain index?

Filed under: JavaScript Interview Questions

The charAt() function of the JavaScript string finds a char element at the supplied index. The index number begins at 0 and continues up to n-1, Here n is the string length. The index value must be positive, higher than, or the same as the string length.

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What do you mean by BOM in Javascript?

Filed under: JavaScript Interview Questions

Browser Object Model is known as BOM. It allows users to interact with the browser. A browser's initial object is a window. As a result, you may call all of the window's functions directly or by referencing the window. The document, history, screen, navigator, location, and other attributes are avai

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What do mean by prototype design pattern?

Filed under: JavaScript Interview Questions

The Prototype Pattern produces different objects, but instead of returning uninitialized objects, it produces objects that have values replicated from a template – or sample – object. Also known as the Properties pattern, the Prototype pattern is used to create prototypes.The introduction of bus  ......

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Methods to create an object in javascript

Filed under: JavaScript Interview Questions

In JavaScript, there are several ways to declare or construct an object.Object.using Class.create Method.Object Literals.using Function.Object Constructor.

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Explain WeakSet in javascript

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In javascript, a Set is a collection of unique and ordered elements. Just like Set, WeakSet is also a collection of unique and ordered elements with some key differences:Weakset contains only objects and no other type.An object inside the weakset is referenced weakly. This means, that if the object   ......

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Why do we use callbacks in Javascript?

Filed under: JavaScript Interview Questions

A callback function is a method that is sent as an input to another function (now let us name this other function "thisFunction"), and it is performed inside the thisFunction after the function has completed execution.JavaScript is a scripting language that is based on events. Instead of waiting for  ......

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Difference between prototypal and classical inheritance in Javascript

Filed under: JavaScript Interview Questions

Programers build objects, which are representations of real-time entities, in traditional OO programming. Classes and objects are the two sorts of abstractions. A class is a generalization of an object, whereas an object is an abstraction of an actual thing. A Vehicle, for example, is a specializati  ......

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What are the primitive data types in JavaScript?

Filed under: JavaScript Interview Questions

A primitive is a data type that isn't composed of other data types. It's only capable of displaying one value at a time. By definition, every primitive is a built-in data type (the compiler must be knowledgeable of them) nevertheless, not all built-in datasets are primitives. In JavaScript, there ar  ......

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Is JavaScript a pass-by-reference or pass-by-value language?

Filed under: JavaScript Interview Questions

The variable's data is always a reference for objects, hence it's always pass by value. As a result, if you supply an object and alter its members inside the method, the changes continue outside of it. It appears to be pass by reference in this case. However, if you modify the values of the object v

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Methods to include JavaScript in HTML Code?

Filed under: JavaScript

Javascript can be added to our HTML code in mostly 2 ways:Internal Javascript: Javascript in this case is directly added to the HTML code by adding the JS code inside the <script> tag, which can be placed either inside the <head> or the <body> tags based on the requirement of the u  ......

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What are the features of JavaScript?

Filed under: JavaScript

Following are the features of javascript:It was developed with the main intention of DOM manipulation, bringing forth the era of dynamic websites.Javascript functions are objects and can be passed in other functions as parameters.Can handle date and time manipulation.Can perform Form Validation.A co

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Write the code for dynamically inserting new components

Filed under: JavaScript Interview Questions

With javascript you can insert content in your html document. This is the most popular feature of javascript programming. Here is the example of how you can insert element in your html document.<html> 
<head> 
<title>inserting new components dynamically</title&g  ......

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Write the code to find the vowels

Filed under: JavaScript Interview Questions

const findVowels = str => {
  let count = 0
  const vowels = ['a', 'e', 'i', 'o', 'u']
  for(let char of str.toLowerCase()) {
    if(vowels.includes(char)) {
      count++
    }
  }
  return count
}

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What do you mean by strict mode in javascript and characteristics of javascript strict-mode?

Filed under: JavaScript Interview Questions

In ECMAScript 5, a new feature called JavaScript Strict Mode allows you to write a code or a function in a "strict" operational environment. In most cases, this language is 'not particularly severe' when it comes to throwing errors. In 'Strict mode,' however, all forms of errors, including silent er  ......

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What is NaN property in JavaScript?

Filed under: JavaScript Interview Questions

NaN property represents the “Not-a-Number” value. It indicates a value that is not a legal number.typeof of NaN will return a Number.To check if a value is NaN, we use the isNaN() function,Note- isNaN() function converts the given value to a Number type, and then equates to NaN.isNaN("Hello") &n  ......

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Is javascript a statically typed or a dynamically typed language?

Filed under: JavaScript Interview Questions

JavaScript is a dynamically typed language. In a dynamically typed language, the type of a variable is checked during run-time in contrast to a statically typed language, where the type of a variable is checked during compile-time.Since javascript is a loosely(dynamically) typed language, variables   ......

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Difference between var and let keyword in javascript

Filed under: JavaScript Interview Questions

Some differences are From the very beginning, the 'var' keyword was used in JavaScript programming whereas the keyword 'let' was just added in 2015.The keyword 'Var' has function scope. Anywhere in the function, the variable specified using var is accessible but in ‘let’ the scope of a vari  ......

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Difference between “ == “ and “ === “ operators

Filed under: JavaScript Interview Questions

Both are comparison operators. The difference between both the operators is that “==” is used to compare values whereas, “ === “ is used to compare both values and types.var x = 2;
var y = "2";
(x == y)  // Returns true since the value of both x and y is the same
(x === y) // Returns

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Why do we use the word “debugger” in javascript?

Filed under: JavaScript Interview Questions

The debugger for the browser must be activated in order to debug the code. Built-in debuggers may be switched on and off, requiring the user to report faults. The remaining section of the code should stop execution before moving on to the next line while debugging.Learn more javascript mcqs here.&nb

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Explain Hoisting in javascript

Filed under: JavaScript Interview Questions

Hoisting is the default behaviour of javascript where all the variable and function declarations are moved on top.This means that irrespective of where the variables and functions are declared, they are moved on top of the scope. The scope can be both local and global.Example 1:hoistedVariable = 3;
  ......

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What are the different data types present in javascript?

Filed under: Javascript

To know the type of a JavaScript variable, we can use the typeof operator.Primitive types String - It represents a series of characters and is written with quotes. A string can be represented using a single or a double quote.Example :var str = "Vivek Singh Bisht"; //using double quotes
var str  ......

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What are disadvantage of JavaScript?

Filed under: JavaScript

Some of the disadvantages of JavaScript are:

a)    No support for multithreading
b)    No support for multiprocessing
c)    Reading and writing of files is not allowed
d)    No support for networking applications.

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What are the advantage of JavaScript?

Filed under: JavaScript

Some of the advantages of JavaScript are:

a)    Server interaction is less
b)    Feedback to the visitors is immediate
c)    Interactivity is high
d)    Interfaces are richer

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Who developed JavaScript, and what was the first name of JavaScript?

Filed under: JavaScript

JavaScript was developed by Brendan Eich, who was a Netscape programmer. Brendan Eich developed this new scripting language in just ten days in the year September 1995. At the time of its launch, JavaScript was initially called Mocha. After that, it was called Live Script and later known as JavaScri

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List some features of JavaScript

Filed under: JavaScript

Some of the features of JavaScript are:
1.    Lightweight
2.    Interpreted programming language
3.    Good for the applications which are network-centric
4.    Complementary to Java
5.    Complementary to HTML
6.    Open source
7.    Cross-platform

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What is JavaScript?

Filed under: JavaScript

JavaScript is a scripting language. It is different from Java language. It is object-based, lightweight, cross-platform translated language. It is widely used for client-side validation. The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the we

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