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
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 yoIn 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
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
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
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">
Create a function that takes length and width and finds the perimeter of a rectangle. ExamplesfindPerimeter(6, 7) β 26findPerimeter(20, 10) β 60findPerimeter(2, 9) β 22 Note: we will make a function findPerimeter which will take two parameters i.e height and width of rectangle. To ca
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) β 1remainder(3, 4) β
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) β 17nextEdge(5, 7) β 11nextEdge(9, 2) β 10 Notes:We will use this algorithm to find the maximum range of a triangle's third edge(side1 + side2)
Write a function that converts hours into seconds. Examples:howManySeconds(2) β 7200howManySeconds(10) β 36000howManySeconds(24) β 86400Notes: 60 seconds in a minute, 60 minutes in an hour <script>function howManySeconds(hour){var seconds = hour * 60 * 60 *;} vCreate a function that takes voltage and current and returns the calculated power.Examples:circuitPower(230, 10) β 2300circuitPower(110, 3) β 330circuitPower(480, 20) β 9600Notes:Requires basic calculation of electrical circuits. Power = voltage * current; We will use this calculation in
Create a function that takes an array containing only numbers and return the first element.Examples:getFirstValue([1, 2, 3]) β 1 getFirstValue([80, 5, 100]) β 80getFirstValue([-500, 0, 50]) β -500Notes:The first element in an array always has an index of 0.Code: <script>function
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) β 27
cubes(5) β 125
cubes(10) β 1000<script>function cubes(number){return number ** 3; //** means power }</script>Create a function that takes the age in years and returns the age in days.Examples:calcAge(65) β 23725 calcAge(0) β 0 calcAge(20) β 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
Write a function that takes the base and height of a triangle and return its area.Examples:triArea(3, 2) β 3 triArea(7, 4) β 14 triArea(10, 10) β 50 We will make a function triArea(base, height) which will take two values as parametersNotes:The area of a triangle is: (base * height)
Create a function that takes a number as an argument, increments the number by +1 and returns the result.Examples:addition(0) β 1
addition(9) β 10
addition(-3) β -2 code: <script>function addition(num){return num+1;} addition(0) // output 1addition(9) // output 10addWrite a function that takes an integer minutes and converts it to seconds.Examples:convert(5) β 300
convert(3) β 180
convert(2) β 120 Code<script>function convert(minutes){return minutes * 60; //1 minutes equals to 60 seconds.}convert(5) // output 300convert(3) // outputCreate a function that takes two numbers as arguments and returns their sum.Examplesaddition(3, 2) β 5
addition(-3, -6) β -9
addition(7, 3) β 10 Code: <script>function addition(a, b){return a+b;} addition(3, 2); //output 5addition(-3, -6); //output -9addition(7, 3); 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
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.
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.
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
The Prototype Pattern produces different objects, but instead of returning uninitialized objects, it produces objects that have values replicated from a template β or sample β object. Also known as the Properties pattern, the Prototype pattern is used to create prototypes.The introduction of bus
In JavaScript, there are several ways to declare or construct an object.Object.using Class.create Method.Object Literals.using Function.Object Constructor.
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
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
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
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
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
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
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
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
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
}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
NaN property represents the βNot-a-Numberβ 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") &nJavaScript 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
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 βletβ the scope of a vari
Both are comparison operators. The difference between both the operators is that β==β is used to compare values whereas, β === β 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
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
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;
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
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.
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
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
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
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