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Found 8591 Articles for Front End Technology

8K+ Views
To get value of data attribute, use −$(“yourSelector”).data()The following is our input type with data attribute −ExampleFollowing is the code − Live Demo Document var value = $('#txtValue').data('value'); console.log("The value is=" + value); OutputThe output is as follows −

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In this article, we will learn to extract every nth element from an array and display a fixed number of values in Javascript. The objective is to filter out every second element (or more generally every nth element) from an array and limit the result to a specified count of elements. We will explore different approaches in JavaScript for achieving this functionality, each offering a unique way to solve the problem. Problem Statement Let's say you have an array that takes every nth element. Display a fixed number of values after extracting the elements. Input Let’s say the following is ... Read More

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Create a custom function to test a number is prime or not in JavaScript.ExampleFollowing is the code −function checkNumberIsPrime(number) { var flag = false; for (start = 2; start < number / 2; start++) { if (number % start === 0) { flag = false; break; } else { flag = true; } } return flag; } var number = 11; if (checkNumberIsPrime(number) == true) { console.log("The number is prime"); } else { console.log("The number is not prime"); }To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo230.js.OutputThe output is as follows −PS C:\Users\Amit\JavaScript-code> node demo230.js The number is prime

154 Views
The Math.ceil() is part of the Math object in JavaScript. Suppose, your value is 4.5 or 4.3, it will give the result 5.Let’s say the following are our values −var result1 = 98; var result2 = 5;Following is the code to display the result difference while using ceil() or not −var result1 = 98; var result2 = 5; console.log("The actual result is=" + result1 / result2); var output = Math.ceil(result1 / result2); console.log("The ceil result is=" + output);To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo229.js.OutputThe output is as ... Read More

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Let’s say the following are our records with some duplicate values −var objectOfNationality = [ { nationality: "Indian" }, { nationality: "American" }, { nationality: "Emirati" }, { nationality: "Indian" }, { nationality: "American" } ];ExampleTo remove duplicate records, use the concept of Set().Following is the code −var objectOfNationality = [ { nationality: "Indian" }, { nationality: "American" }, { nationality: "Emirati" }, { nationality: "Indian" }, ... Read More

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Let’s say the following is our string in dot notation −const keys = "details1.details2.details3.details4.details5"And the following is our array −const firsName = "David";To turn into a nested object, use the concept of split(‘.’) along with map().ExampleFollowing is the code −const keys = "details1.details2.details3.details4.details5" const firsName = "David"; var tempObject = {}; var container = tempObject; keys.split('.').map((k, i, values) => { container = (container[k] = (i == values.length - 1 ? firsName : {})) }); console.log(JSON.stringify(tempObject, null, ' '));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo227.js.OutputThe output is as ... Read More

236 Views
Let’s say we are getting two values with prompt −var firstvalue = parseInt(prompt("Enter the value1")); var secondvalue = parseInt(prompt("Enter the value2"));ExampleFollowing is the code − Live Demo Document var firstvalue = parseInt(prompt("Enter the value1")); var secondvalue = parseInt(prompt("Enter the value2")); if (firstvalue * secondvalue > 50) document.write("Result is correct"); else document.write("Result is not correct"); To run the above program, save the file name anyName.html (index.html). Right click on the file and select the option “Open ... Read More

1K+ Views
Finding specific words in an array is a common task in JavaScript, especially when you need to filter data, search through lists, or analyze text. An array is a simple and fundamental data structure in JavaScript that stores multiple values of the same data type. JavaScript has several built-in methods, like includes(), filter(), and find(), that help you search for specific words easily. This article will explain these methods with examples. Finding Specific Words in an Array Finding specific words in an array can be done in the following ways: Using includes() method Using filter() method Using find() ... Read More

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You cannot change the value of an object when it is defined using const keyword.After changing it will remain same.Let’s say the following is our variable defined with const −const details1 = { firstName: 'David', subjectDetails: { subjectName: 'JavaScript' } }ExampleFollowing is the code to change the const variable, which would only display the initial value −const details1 = { firstName: 'David', subjectDetails: { subjectName: 'JavaScript' } } const details2 = { ...details1, subjectDetails: { ...details1.subjectDetails }, firstName: 'David' } details2.subjectDetails.subjectName = 'Java ' console.log(details1);To run the above program, you need to use the following command ... Read More

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Let’s say the following are our objects −var object1 = { firstName: "David" }; var object2 = { firstName: "David" };You will not get the correct result using comparison operator (== or ===). Use JSON.stringify() for this.ExampleFollowing is the code implementing both the ways and showing the correct result −var object1 = { firstName: "David" }; var object2 = { firstName: "David" }; if (object1 == object2) console.log("using == operator result ==> true"); else console.log("using == operator result ==> false"); if (JSON.stringify(object1) == JSON.stringify(object2)) console.log("using JSON.stringify() operator result ==> true"); else console.log("using JSON.stringify() operator result ==> ... Read More