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Use document.getElementById() and display using innerHTML. Following is the code −Example Live Demo Document var jsonObject="name"; var value = jsonObject.split(" "); var add = {}; value.forEach(function(v){ add[v] ? add[v]++ : add[v] = "John"; }); document.getElementById("objectId").innerHTML = JSON.stringify(add); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
No, the parent object won’t get updated. Use Object.assign() with some parameters and check. Following is the code −Examplevar firstObject = { name: 'John' }; var secondObject = { name: 'Carol' }; console.log("Before merging="); console.log(firstObject); var afterMerging = Object.assign({}, firstObject, secondObject); afterMerging.name = 'Smith'; console.log("After merging="); console.log(firstObject);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo131.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo131.js Before merging= { name: 'John' } After merging= { name: 'John' }
To check for case insensitive values, use regular expression in JavaScript. Following is the code −Examplevar allNames = ['john','John','JOHN']; var makeRegularExpression = new RegExp(allNames.join( "|" ), "i"); var hasValue = makeRegularExpression.test("JOHN"); console.log("Is Present="+hasValue);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo130.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo130.js Is Present=true
Let’s the following is our input type, wherein the user will search −Now, use hide() and show() to display only relevant search and hide rest. For example, on typing “Ja”, related keywords like “Java” and “JavaScript” should be visible because it begins with “Ja”.Example Live Demo Document Enter the keyword.. JavaScript John Smith Java David Miller -1) { $(this).show(); $(this).prev('.subjectName').last().show(); } else { $(this).hide(); ... Read More
Let’s say the following is our table with product quantity records − qty: qty: qty: qty: Let us now hide using the hide() method. Following is the code −Example Live Demo Document qty: qty: qty: qty: $('.hideRowContainingZeroValue input').filter(function(){ return +this.value === 0; }).closest("tr").hide() To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
You need to use currentDate with the help of new Date().getDate(). The syntax is as follows −var anyVariableName= yourCurrentDate - yourSubstractDateOfCurrentMonth;Examplevar currentDate=new Date().getDate(); var substractDate=new Date("2020-07-01").getDate(); const numberOfDaysInCurrentMonthOnly = currentDate-substractDate; console.log(numberOfDaysInCurrentMonthOnly);NoteToday’s date is - 28-07-2020To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo129.jsPS C:\Users\Amit\JavaScript-code> node demo129.js 27
Let’s say, we have subject records with the time when we are planning to study them −const scheduleDetails = [ { subjectName: 'JavaScript', studyTime: '5 PM - 11 PM' }, { subjectName: 'MySQL', studyTime: '12 AM - 4PM' } ]Here is how we can use the map(). Following is the code −Exampleconst scheduleDetails = [ { subjectName: 'JavaScript', studyTime: '5 PM - 11 PM' }, { subjectName: 'MySQL', studyTime: '12 AM - 4PM' } ] function timeToReadSubjectName(scheduleDetails) { var currentTime = new Date().getHours(); let result = ''; scheduleDetails.map(obj => { ... Read More
To format HSON string in JavaScript, use JSON.stringify() with some parameters. Following is the code −Examplevar details = { studentId: 101, studentFirstName: 'David', studentLastName: 'Miller', studentAge:21, subjectDetails: { subjectId: 'JavaScript_101', subjectName: 'Introduction to JavaScript', } }; console.log("Not Pretty JSON Format=") console.log(JSON.stringify(details)); console.log("Pretty JSON Format=") console.log(JSON.stringify(details, null, 3));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo127.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo127.js Not Pretty JSON Format= {"studentId":101, "studentFirstName":"David", "studentLastName":"Miller", "studentAge":21, "subj ectDetails":{"subjectId":"JavaScript_101", "subjectName":"Introduction to JavaScript"}} Pretty ... Read More
To check for consecutive numbers like 100, 101, 102, etc., use the concept of reduce(). TRUE would be returned for consecutive numbers, else false is the return value.Exampleconst sequceIsConsecutive = (obj) => Boolean(obj.reduce((output, lastest) => (output ? (Number(output.number) + 1=== Number(lastest.number) ? lastest : false) : false))); console.log("Is Consecutive="+sequceIsConsecutive ([{ number: '100' }, {number: '101'} ,{number: '102' }])); console.log("Is Consecutive="+sequceIsConsecutive([{ number: '100' }, {number: '102'} ,{number: '104' }]));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo126.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo126.js Is Consecutive=true Is Consecutive=falseRead More
Following is our object −var customerDetails ={ "customerFirstName":"David", "customerLastName":"Miller", "customerAge":21, "customerCountryName":"US" };Now, create a new array and use push() function. Following is the code −Examplevar customerDetails ={ "customerFirstName":"David", "customerLastName":"Miller", "customerAge":21, "customerCountryName":"US" }; var customerObjectToArray = []; customerObjectToArray.push(customerDetails); console.log(customerObjectToArray);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo125.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo125.js [ { customerFirstName: 'David', customerLastName: 'Miller', customerAge: 21, customerCountryName: 'US' } ]