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Javascript Articles
Page 9 of 534
JavaScript Prompt Example
In this article, we will learn to use the prompt() function in Javascript. The prompt() method in JavaScript allows developers to collect user input through a pop-up dialog box. What is the prompt() Method in JavaScript? The prompt dialog box is very useful when you want to pop-up a text box to get user input. Thus, it enables you to interact with the user. The user needs to fill in the field and then click OK. This dialog box is displayed using a method called prompt(). Syntax var userInput = prompt("Message", "Default value"); The following are the parameters of the ...
Read MoreJavaScript: Computing the average of an array after mapping each element to a value
Computing the average of an array after mapping each element to a value in JavaScript can be done by using the forEach() loop, the parseInt() method, the reduce() method, and the for..of loop. In this article, we are going to fetch all the values from an array and after mapping each element to a numerical value we will calculate its sum thus to compute its average. Given below is an array consisting of values. We will compute the average by summing up the values and then dividing it by the number of values available. Suppose Input is: [1, 2, ...
Read MoreJavaScript to push value in empty index in array
To push value in an empty index in an array, we must write an array function pushAtEmpty() that takes in an element and pushes it at the first empty index it finds in the array it is used in the context of. If there are no empty spaces, the element should be pushed to the end of the array. The arrays are data structures in JavaScript that are used to store values of the same type in a linear form. Arrays are basic data structures that every developer works on. While working with arrays, they commonly work on pushing elements ...
Read MoreJavaScript Sum of two objects with same properties
Obtaining the sum of two objects in JavaScript having the same properties Obtaining the sum of two objects in JavaScript having the same properties is a basic implementation with JavaScript objects. To do this, we are required to write a JavaScript function that takes in two such objects. The function should sum the values of identical properties into a single property. In JavaScript, objects are data structures that allow you to store collections of key-value pairs. Sometimes, you might need to sum the values of two objects that have the same properties. This article will guide you on how to ...
Read MoreJavaScript input type=submit is not working?
The input type submit is not working; it is one of the common issues that every developer faces while working with JavaScript forms. To make it work, you can use an onclick event listener with input type = "submit" or prevent its default behaviour. This article looks at common reasons why a submit button might not work in JavaScript and offers solutions to resolve this issue. Common Reasons for Submit Button Issues The following are listed are some common reasons that may lead to this issue: Missing Event Listener − If you have not ...
Read MoreJavaScript: How to map array values without using \\\"map\\\" method?
Mapping array values without using the map method can be done by using forEach() method, reduce() method, for loop, and while loop. In this article, we will implement some methods that will work efficiently for mapping array values. Table of Content Mapping array values without using map method can be done in the following ways: Using forEach() Using reduce() Using a for Loop Using while Loop Using forEach() The forEach() method allows you to iterate through each element in ...
Read MoreJavaScript: How to filter out Non-Unique Values from an Array?
To filter out non-unique values from an array in JavaScript, you can use the filter() method, a for loop, the set and filter() method, and the reduce() method. In this article, we will filter out non-unique values and return an array that only contains unique non-repeating elements. Arrays are data structures used to store data in a structured format. We can store the data in an array and retrieve them using their indexes. These indexes serve as a key for these values. Table of Content Filtering non-unique values from an array can be done in the following ways: ...
Read MoreJavaScript code to find nth term of a series - Arithmetic Progression (AP)
To find the nth term of an arithmetic progression in JavaScript, we need to write a function that will calculate the nth term. In this article, we will explore how to find the nth term of an AP using JavaScript. We are required to write a JavaScript function that takes in three numbers as arguments (the first two numbers are supposed to be the starting two consecutive terms of an arithmetic progression). And the third number, say n, is the 1 index-based element of the series whose value we must calculate. If the input is 2, 5, 7 Then ...
Read MoreJavaScript - Check if value is a percentage?
To check the value for percentage, use a regular expression. When dealing with user input or processing data in JavaScript, it's important to make sure a value is a valid percentage. This article shows you how to check if a value is a percentage using JavaScript, highlighting a useful method that involves regular expressions. Let's say the following is our value var value="97%"; To check the value for percentage, we are using a regular expression. Using Regular Expression The best way to check if a string is in the correct percentage format is by using regular expressions. ...
Read MoreJavaScript Basic Array Methods
In this article, we will learn about different basic array methods in JavaScript. Adding and Removing Elements Some basic JavaScript array methods for adding and removing elements − Method Description ...
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