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Let’s say the following are our strings with commas −"My Favorite subject is, " "My Favorite subject is, and teacher name is Adam Smith" "My Favorite subject is, and got the marks 89"To replace commas, use replace and in that, use Regular Expression. Following is the code −Exampleconst makingRegularExpression = /, (?=[^, ]*$)/; replaceComma("My Favorite subject is, "); replaceComma("My Favorite subject is, and teacher name is Adam Smith"); replaceComma("My Favorite subject is, and got the marks 89"); function replaceComma(values){ console.log(values, " ==== replaced by JavaScript ==== ", values.replace(ma kingRegularExpression, " JavaScript")); }To run the above program, you need ... Read More
Let’s say the following is our string with name −var studentFullName="John Smith";Use split() to split the first name and last name. Following is the code −Examplevar studentFullName="John Smith"; var details=[] var details=studentFullName.split(' '); console.log("StudentFirstName="+details[0]) console.log("StudentLastName="+details[1]);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo163.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo163.js StudentFirstName=John StudentLastName=Smith
The primitive data types are number, string, boolean, float etc. The non-primitive data types (Reference Type) are Array, Object etc.Examplevar number=10; var stringValue="John"; var booleanValue=true; var obj={}; var newArray=new Array(); console.log("The data type is="+typeof number); console.log("The data type is="+typeof stringValue); console.log("The data type is="+typeof booleanValue); console.log("The data type is="+typeof obj); console.log("The data type is="+typeof newArray);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo162.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo162.js The data type is=number The data type is=string The data type is=boolean The data type is=object The ... Read More
To extract hostname from URL string, use split() function. Following is the code −Examplefunction gettingTheHostNameFromURL(websiteURL) { var getTheHostName; if (websiteURL.indexOf("//") > -1) { getTheHostName = websiteURL.split('/')[2]; } else { getTheHostName = websiteURL.split('/')[0]; } getTheHostName = getTheHostName.split(':')[0]; getTheHostName = getTheHostName.split('?')[0]; return getTheHostName; } var websiteURL="https://www.tutorialspoint.com/java/index.htm";var websiteURL1="https://www.tutorix.com/about_us.htm"; var websiteURL2="https://www.tutorialspoint.com/execute_python_online.php"; console.log(gettingTheHostNameFromURL(websiteURL)) console.log(gettingTheHostNameFromURL(websiteURL1)) console.log(gettingTheHostNameFromURL(websiteURL2))To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo161.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo161.js www.tutorialspoint.com www.tutorix.com www.tutorialspoint.comRead More
For this, use . Since you want to type in it, do not forget to set as −contenteditable="true"Example Live Demo Document span{ border: solid 2px skyblue; } div{ max-width: 500px; } John Smith 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 −
To find the index of a two-dimensional array of objects, use two for loops, one for row and another for column. Following is the code −Examplefunction matrixIndexed(details, name) { var r; var c; for (r = 0; r < details.length; ++r) { const nsDetails = details[r]; for (c = 0; c < nsDetails.length; ++c) { const tempObject = nsDetails[c]; if (tempObject.studentName === name) { return { r, c}; } } ... Read More
To get sequence number in loops, use the forEach() loop. Following is the code −Examplelet studentDetails = [ { id: 101, details: [{name: 'John'}, {name: 'David'},{name: 'Bob'}]}, {id:102, details: [{name:'Carol'},{name:'David'}, {name:'Mike'}] } ]; var counter = 1; studentDetails.forEach(function(k){ k.details.forEach(function(f) { console.log(counter++); } ); });To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo159.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo159.js 1 2 3 4 5 6
Let’s say the following is our array of objects with duplicates −var studentDetails=[ {studentId:101}, {studentId:104}, {studentId:106}, {studentId:104}, {studentId:110}, {studentId:106}, ]Use the concept of set to remove duplicates as in the below code −Examplevar studentDetails=[ {studentId:101}, {studentId:104}, {studentId:106}, {studentId:104}, {studentId:110}, {studentId:106}, ] const distinctValues = new Set const withoutDuplicate = [] for (const tempObj of studentDetails) { if (!distinctValues.has(tempObj.studentId)) { distinctValues.add(tempObj.studentId) withoutDuplicate.push(tempObj) } } console.log(withoutDuplicate);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name ... Read More
For this, use Object.assign(). Following is the code −Exampleconst details = {john:{'studentName':'John'}, david:{'studentName':'David'}, mike:{'studen tName':'Mike'}, bob:{'studentName':'Bob'}, carol:{'studentName':'Carol'}}, join_values = ['David', 'Carol'], output = Object.assign( {}, ...Object .keys(details) .map(key => ({[key]: { ...details[key], lastName: join_values.includes(details[key].studentName) ? 'Miller' : 'Smith' }}))) console.log(output)To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo157.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo157.js { john: ... Read More
We will be creating two buttons, one for Increment and another Decrement −On clicking Increment (+), user will be able to increment the number in input type numberOn clicking Decrement (-), user will be able to decrement the number in input type numberExample Live Demo Document + - function increment() { document.getElementById('demoInput').stepUp(); } function decrement() { document.getElementById('demoInput').stepDown(); } To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option ... Read More