You can use the concept of Map(). In JavaScript, map has the key value concept in which key must be unique.We also need to use the join() method to join Map values. Following is the code −Examplelet queryStringAppendWithURL = new Map(); queryStringAppendWithURL.set("firstParamter", ["name=John", "age=23", "countryName=US"]); queryStringAppendWithURL.set("secondParamter", ["subjectName=JavaScript", "Marks=91"]); let appendValue ... Read More

To conditionally change object property, use the logical AND operator ( &&).If both the operands are non-zero, then the condition becomes true in JavaScript’s logical AND operator.Examplelet marksDetails = { Mark1: 33, Mark2: 89 }, isBacklog = false; console.log("Result when backlog is set to false==="); console.log({ ...marksDetails, ...isBacklog === true ... Read More

To remove leading zeroes in an array, use the concept of filter(). Following is our input wherein we will remove the leading zeroes −[10, 0, 12, 0, 0]) [0, 0, 0, 0, 0, 0, 10, 12, 0]) [12, 0, 0, 1, 0, 0])Exampleconst removeLeadingZero = input => input.filter((lastValue => value ... Read More

To change value of input, use the concept of document. The syntax is as follows −document.yourFormName.yourTextName.value=anyValue;Let’s say the following is our input type calling submitForm() on clicking “Submit Form” −         The submitForm() function changing the value of input −function submitForm(){    document.studentForm.txtInput.value='STUDENT-100'; }Example Live Demo ... Read More

If onclick not working for two or more links, then use the document.querySelectorAll() in JavaScript. Following is the code −Example Live Demo Document www.example.com www.test.com    const values = document.querySelectorAll('[class=class1]');    values.forEach(function(v) {       console.log(v.innerHTML);    }); ... Read More

To check if the input is a number or letter, use the isNaN() function from JavaScript. It returns true if the value is NaN i.e. Not a Number. Following is the code −Example Live Demo Document Enter the value: ... Read More

To check if array element contains a false value, you can use the Object.values() in JavaScript. Following is the code −Exampleconst details = [    {       customerDetails:       [          {             isMarried: true       ... Read More

You need to use async and await with body onLoad attribute Following is the code −index.htmlExample Live Demo Document    async function callFunction(){       await testFunction();    }    function testFunction(){       console.log("Hi...");    } ... Read More

For this, use toUpperCase() along with toLowerCase(). Following is the code −Examplefunction capitalEveryFirstletter(subjectTitle) {    return subjectTitle.split(' ')    .map(st => st.charAt(0).toUpperCase() + st.slice(1).toLowerCase())    .join(' ');; } var subjectTitle="iNtroduction tO JavaScript ProgRAMMINg"; var output=capitalEveryFirstletter(subjectTitle); console.log("The result="+output);To run the above program, you need to use the following command −node fileName.js.Here, ... Read More

To create a global variable, you need to place variable inside the tag. Following is the code −Example Live Demo Document checkGlobalVariable    var globalVariable;    $(document).ready(function() {       function initializeGlobalVariable() {          globalVariable ... Read More