Let’s say the following is our list −var details=[    {id:101, name:"John", age:21},    {id:111, name:"David", age:24},    {id:1, name:"Mike", age:22},    {id:"", name:"Sam", age:20},    {id: 1, name:"Carol", age:23},    {id:null, name:"Robert", age:25},    {id:1, name:"Adam", age:24},    {id:"", name:"Chris", age:23} ];You can use the concept of filter to retrieve values based on specific ID.Examplevar details=[    {id:101, name:"John", age:21},    {id:111, name:"David", age:24},    {id:1, name:"Mike", age:22},    {id:"", name:"Sam", age:20},    {id: 1, name:"Carol", age:23},    {id:null, name:"Robert", age:25},    {id:1, name:"Adam", age:24},    {id:"", name:"Chris", age:23} ]; var getIdWithValue1 = details.filter(obj => obj.id === 1); console.log(getIdWithValue1);To ... Read More

Let’s say the following are our coordinates −var listOfStrings = ["10.45322, -6.8766363", "78.93664664, -9.74646646", "7888.7664664, -10.64664632"];To convert the above into two float lists of Latitude and Longitude, use split() on the basis of comma(, ) along with map().Examplevar listOfStrings = ["10.45322, -6.8766363", "78.93664664, -9.74646646", "7888.7664664, -10.64664632"]; var latitude = []; var longitude = []; listOfStrings.forEach(obj => obj.split(', ') .map(Number) .forEach((value, index) => [latitude, longitude][index].push(value)) ); console.log("All positive value is latitude=") console.log(latitude); console.log("All negative value is longitude=") console.log(longitude);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo180.js.OutputThis will produce the following output ... Read More

To ignore a specific value, use the logical Not (!) operator in if condition and fetch watching you want to include.Examplevar customerDetails=[    {       customerName:"John",       customerAge:28,       customerCountryName:"US"    },    {       customerName:"David",       customerAge:25,       customerCountryName:"AUS"    },    {       customerName:"Mike",       customerAge:32,       customerCountryName:"UK"    } ] for(var i=0;i node demo179.js The country name is=US The country name is=UK

To select random values from an array, use the concept of Math.random().Examplevar subjectNames = ["Javascript", "MySQL", "Java", "MongoDB", "Python","Spring Framework"]; for(var index = subjectNames.length - 1; index > 0; index--){    var rndIndex = Math.floor(Math.random() * (index + 1));    var subjNameTemp = subjectNames[rndIndex];    subjectNames[rndIndex] = subjectNames[index];    subjectNames[index] = subjNameTemp; } var getRandomSubjectName = subjectNames.slice(0, 3); console.log(getRandomSubjectName);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo178.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo178.js [ 'Javascript', 'MySQL', 'Python' ]

Let’s say the following is our array of objects −var details = [{    studentName: "John",    studentMarks: 92 }, {    studentName: "David",    studentMarks: 89 }, {    studentName: "Mike",    studentMarks: 98 }, ];To get only specific values in an array of objects in JavaScript, use the concept of filter().Examplevar details = [{    studentName: "John",    studentMarks: 92 }, {    studentName: "David",    studentMarks: 89 }, {    studentName: "Mike",    studentMarks: 98 }, ]; var specificValuesFromArray = details.filter(obj => obj.studentMarks === 92 || obj.studentMarks === 98); console.log(specificValuesFromArray)To run the above program, you need to ... Read More

For this, you can use filter() along with map().Exampleconst details =[    { customerName: 'John', customerCountryName: 'UK', isMarried :true },    { customerName: 'David', customerCountryName: 'AUS', isMarried :false },    { customerName: 'Mike', customerCountryName: 'US', isMarried :false } ] let tempObject = details.filter(obj=> obj.isMarried == true); tempObject["customerNameWithIsMarriedFalse"] = details.filter(obj => obj.isMarried== false).map(obj => obj.customerName); console.log(tempObject);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo176.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo176.js [    { customerName: 'John', customerCountryName: 'UK', isMarried: true }, customerNameWithIsMarriedFalse: [ 'David', 'Mike' ] ]

For this, use click() along with parseInt().Example Live Demo Document 10 addValue10EachTimePressMe    addValue = 0;    $("#addSequenceOf10").click(function() {       var actualValue = parseInt($("#add").html());       addValue =addValue+ actualValue;       $("#sequenceValue").html(addValue);    }); To run the above program, just save the file name anyName.html(index.html) and right click on the file and select the option open with live server in VS Code editor.OutputThis will produce the following output −Now, press the button you will get 10 then 20 30 40…….N; as in the below output −After clicking one more time, the snapshot is as follows.This will produce the following output −

When working with strings in JavaScript, you might encounter scenarios where you need to clean or format text by removing specific portions. A common task is to remove text after a comma and the following word. This can be achieved efficiently using JavaScript Regular Expressions (Regex). In this article, we’ll show you how to do it step-by-step. Why Use Regex for Text Manipulation? Regex, short for Regular Expressions, is a powerful tool for pattern matching and text processing. It allows you to identify and manipulate text patterns with precision, making tasks like cleaning data or reformatting strings much simpler. How ... Read More

For iterating and printing, use forEach() loop in JavaScript.Exampleconst details =[    {       "studentId":101,       "studentName": "John Doe",    },    {       "studentId":102,       "studentName": "David Miller",    }, ]; details.forEach(obj=>{    console.log("StudentId="+obj.studentId);    console.log("StudentName="+obj.studentName); })To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo174.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo174.js StudentId=101 StudentName=John Doe StudentId=102 StudentName=David Miller

You can use destructed array in this case.Examplefunction multiply(firstParameterDefaultValue=10, secondParameterValue) {    return firstParameterDefaultValue * secondParameterValue; } console.log("The result="+multiply(...[,10]));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo173.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo173.js The result=100