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The best way to reduce and merge a collection of objects, use the concept of Object.values() along with reduce().Following is the object −var details = [ { studentId: 10, marks: 75, studentName: "John" }, { studentId: 10, marks: 75, studentName: "John" }, { studentId: 11, marks: 98, studentName: "Bob" } ];ExampleFollowing is the code to reduce and merge −var details = [ { studentId: 10, marks: 75, studentName: "John" }, { studentId: 10, marks: 75, studentName: "John" }, { studentId: 11, marks: 98, studentName: "Bob" } ]; output = Object.values(details.reduce((value, object) => { ... Read More
Let’s say the following are our time data −var startHour = dayjs().hour(10) var endHour = dayjs().hour(22)To get the difference, use the diff() method −ExampleFollowing is the code − Live Demo Document var startHour = dayjs().hour(10) var endHour = dayjs().hour(22) console.log("The hours difference is=" + endHour.diff(startHour, "hours")); To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −OutputThe output is as follows −
Let’s say the following are ourrinput type checkbox −John David We want to check any of the checkbox. Use the checked property to check the checkbox.ExampleFollowing is the code − Live Demo Document John David document.querySelector('#checkedValue2').checked = true To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −OutputThe output is as follows −
Let’s say the following are our values −'6778922' '76633 56 1443' '8888 4532 3232 9999'We want the preceding characters to be replaced with 4 asterisks and the display rest of the last 3 characters. The output should be −**** 922 **** 443 **** 999For such conditions, use the replace() and set regex in it.ExampleFollowing is the code −const hideDataWithDot = value => value.replace(/.+(.{3})$/, "**** $1"); console.log(hideDataWithDot('6778922')) console.log(hideDataWithDot('76633 56 1443')) console.log(hideDataWithDot('8888 4532 3232 9999')) To run the above program, use the following command −node fileName.js. Here, my file name is demo236.js.OutputThe output is as follows −PS C:\Users\Amit\javascript-code> node demo236.js **** ... Read More
Let’s say the following is our string with comma and whitespace −var sentences = " John , David , Bob , Mike, Carol ";To split the sentences by comma, use split(). For removing surrounding spaces, use trim().ExampleFollowing is the code −var sentences = " John , David , Bob , Mike, Carol "; console.log("The value=" + sentences); var result = sentences.split(", ").map(function (value) { return value.trim(); }); console.log("After modifying the value=") console.log(result);To run the above program, use the following command −node fileName.js.Here, my file ... Read More
Let’s say the following is our array with duplicate elements −var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000];We want the output to be −[10, 20, 100, 40, 1000];To display only the unique elements, use the concept of filter.ExampleFollowing is the code −var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000]; console.log("With Duplicates Values="); console.log(duplicateNumbers); var noDuplicateNumbersArray = duplicateNumbers.filter(function (value, index, array) { return array.indexOf(value) === index; } ); console.log("Without Duplicates Values=") console.log(noDuplicateNumbersArray);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo234.js.OutputThe output is as ... Read More
This is the concept of Bubble Sort. It compares to adjacent element if it is lesser it will swap the value.ExampleFollowing is the code −var numbers = [10, 100, 30, 40, 90, 4, 91, 56, 78]; function bubbleSorting(numbers) { for (var outer = 0; outer < numbers.length; outer++) { for (var inner = 0; inner < numbers.length; inner++) { if (numbers[outer] < numbers[inner]) { var temp = numbers[outer]; numbers[outer] = numbers[inner]; numbers[inner] = temp; ... Read More
For this, use tag. Set it to contenteditable −We have set the following style for paste − pre { min-height: 150px; min-width: 300px; font-family: 'Times New Roman', Times, serif; white-space: pre; background-color: rgb(19, 22, 27); color: #98d8e7; } Now, you can use paste event listener −var getTheData = document.getElementById('data'); getTheData.addEventListener('paste', PutTheDataOnEditor);ExampleFollowing is the code − Live Demo Document pre { min-height: 150px; min-width: 300px; font-family: ... Read More
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 −
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