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 ... Read More

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 ... 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 ... 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 ([{ ... Read 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, ... Read More

Let’s say the following is our input type with value, “John Smith” −To change, use the attr() method −$('#changeTheName').attr('value', 'Please enter your name.......');You need to use the concept of attr(). Following is the code −Example Live Demo Document    $('#changeTheName').attr('value', ... Read More

Let’s say the following is our file name −var actualJavaScriptFileName = "demo.js";Following is the word to be inserted before the dot extension −var addValueBetweenFileNameAndExtensions = "programming";At first, you need to split() the file name on the basis of dot(.) and then to insert a character, you can use the concept ... Read More

To convert string type value to array type, use the parse() method. Following is the code −Examplevar customerDetails='[    {"name": "John", "countryName": "US"},    {"name": "David", "countryName": "AUS"},    {"name": "Bob", "countryName": "UK"} ]'; console.log("The actual value="+customerDetails); var convertStringToArray=JSON.parse(customerDetails); console.log("After converting string to array objects="); console.log(convertStringToArray);To run the above program, ... Read More