Let’s say the following is our array object −var arrayObject =    [       "John",       "David",       "Mike"    ]Use length property to set the length to 0 and clear memory.The syntax is as follows to clear memory and allocate again −yourArrayObjectName.length=0; // ... Read More

To fetch alternative values, use the array index and check with the following condition −if(index%2==0) { // code } The above will display the even values.ExampleFollowing is the code −var subjectsName=["MySQL", "JavaScript", "MongoDB", "C", "C++", "Java"]; for(let index=0;index node demo222.js Subject name at even position=MySQL Subject name at even position=MongoDB Subject ... Read More

Use get keyword to make getter function.ExampleFollowing is the code −const studentDetails = {    studentName: "David Miller",    get studentName() {       console.log('I am calling the getter method...')    } } console.log(studentDetails.studentName);To run the above program, you need to use the following command −The output is as ... Read More

For this, use the “this” keyword.ExampleFollowing is the code −class Employee {     constructor() {         this.tempObject = [             {                 firstName: "David",                 setTheAnotherFirstName() { ... Read More

To add property, use map(). Let’s say the following is our array −const firstname = ['John', 'David', 'Bob'];Following are our array of objects −const studentDetails = [    {       firstname: 'Carol',       marks: 78    },    {       firstname: 'Mike',     ... Read More

Let’s say we have the following variables −var value1 = 10; var value2 = 10.15;Use the Number() condition to check that a number is float or integer −Number(value) === value && value % 1 !== 0; }ExampleFollowing is the code −function checkNumberIfFloat(value) {    return Number(value) === value && value ... Read More

For ternary operator alternative, simply use if else in JavaScript. Let’s say, we have two numbers −var number1=12; var number2=12;To compare, we can use if else, instead of the ternary operator −if(number1==number2) console.log("true"); else console.log("false");ExampleFollowing is the code −var number1=12; var number2=12; var result=(number1==number2)?true:false; console.log(result); if(number1==number2)    console.log("true"); else   ... Read More

To remove, use remove() and append() to add option in already created select list. Let’s say the following is our select −    JavaScript    MySQL ExampleFollowing is the code to remove all the options and add a new one − Live Demo            Document ... Read More

Use tag for a new line.ExampleFollowing is the code −            Document           My Name is David Miller        document.getElementById("headingDemo").innerHTML = "My Favourite Subject is JavaScript" + '' + "I ... Read More

To fix this, use the concept of this keyword. User another variable to hold the value of object, to use that inside the inner function.ExampleFollowing is the code −function Employee() {    this.technologyName = "JavaScript";    var currentTechnologyName = this;    function workingTechnology() {       console.log("I am working ... Read More