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Javascript Articles
Page 362 of 534
JavaScript Adding array name property to JSON object [ES5] and display in Console?
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, you need to use the following command −node fileName.js.Here, my file name is demo125.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo125.js [ { customerFirstName: 'David', customerLastName: 'Miller', customerAge: 21, customerCountryName: 'US' } ]
Read MoreInsert a word before the file name’s dot extension in JavaScript?
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 of template variables. Following is the code −Examplevar addValueBetweenFileNameAndExtensions = "programming"; var actualJavaScriptFileName = "demo.js"; console.log("The actual File name="+actualJavaScriptFileName); var [fileName, fileExtension] = actualJavaScriptFileName.split('.'); console.log("After adding into the file name="); console.log(`${fileName}- ${addValueBetweenFileNameAndExtensions}.${fileExtension}`)To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo124.js. ...
Read MoreHow to convert string type value to array type in JavaScript?
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, you need to use the following command −node fileName.js.OutputHere, my file name is demo123.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo123.js The actual value=[{"name": "John", "countryName": "US"}, {"name": "David", "countryName": "AUS"}, {"name": "Bob", "countryName": "UK"}] After converting string to array objects=[ { name: 'John', countryName: 'US' ...
Read MoreHow to set text in <strong> tag with JavaScript?
At first, set the element −Replace This strong tagThe id attribute set above would be used set the text using # −$(document).ready(function(){ $("#strongDemo").html("Actual value of 5+10 is 15....."); });Example Live Demo Document Replace This strong tag $(document).ready(function(){ $("#strongDemo").html("Actual value of 5+10 is 15....."); }); 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 −
Read MoreHow to group JSON data in JavaScript?
To group JSON data, you need to extract all the keys and use the push(). Following is the code −Examplevar details= { "1": { name:"John" }, "2": { name:"John" }, "3": { name:"David" } var objectWithGroupByName = {}; for (var key in details){ var name = details[key].name; if (!objectWithGroupByName[name]){ objectWithGroupByName[name] = []; } objectWithGroupByName[name].push(details[key]); } console.log(objectWithGroupByName);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo122.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo122.js { John: [ { name: 'John' }, { name: 'John' } ], David: [ { name: 'David' } ] }
Read MoreCall a JavaScript class object with variable?
Let’s say the following is our variable −var message = 'This is the Class Demo';Following is our object, var object = new FirstClass(message)The class FirstClass −class FirstClass{ constructor( message){ this.message = message; } }We will use eval() to call a JavaScript class object with variable. Following is the code −Exampleclass FirstClass{ constructor( message){ this.message = message; } } var message = 'This is the Class Demo'; var object = new FirstClass(message) console.log(eval(object).message);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo121.js.OutputThis ...
Read MoreHow to convert comma separated text in div into separate lines with JavaScript?
Let’s say the following is our comma separated text in div − This, is, the, first, JavaScript, program To convert comma separated text into separate lines, you need to use trim() along with split() on the basis of comma(, ).Example Live Demo Document This, is, the, first, JavaScript, program var allTheData = document.querySelector('.commaSeparated').textContent.trim().split(', ') var separateList = '' allTheData.forEach(function(value) { separateList += '' + value + ''; }); separateList += ''; document.querySelector(".commaSeparated").innerHTML = separateList; To run the ...
Read MoreHow to use JavaScript map() method to access nested objects?
Let’s say the following is our nested objects −var details = [ { id:"101", firstName:"John", lastName:"Smith", age:25, countryName:"US", subjectDetails: { subjectId:"Java-101", subjectName:"Introduction to Java" }, }, { "uniqueId": "details_10001" } ]Use map() along with typeOf to access nested objects. Following is the code −Examplevar details = [ { id:"101", firstName:"John", lastName:"Smith", ...
Read MoreHow to get key name when the value contains empty in an object with JavaScript?
Let’s say the following is our object −var details = { firstName: 'John', lastName: '', countryName: 'US' }Use Object.keys() along with find() to get the key name with empty value. Following is the code −Examplevar details = { firstName: 'John', lastName: '', countryName: 'US' } var result = Object.keys(details).find(key=> (details[key] === '' || details[key] === null)); console.log("The key is="+result);To run the above program, you need to use the following command −node fileName.js.OutputHere, my file name is demo118.js. This will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo118.js The key is=lastName
Read MoreCheck whether a value exists in JSON object?
Let’s say the following is our object −var apiJSONObject = [ {subjectName:"MySQL"}, {subjectName:"Java"}, {subjectName:"JavaScript"}, {subjectName:"MongoDB"} ]Let’s check for existence of a value “JavaScript” −Examplevar apiJSONObject = [ {subjectName:"MySQL"}, {subjectName:"Java"}, {subjectName:"JavaScript"}, {subjectName:"MongoDB"} ] for(var i=0;i node demo117.js The search found in JSON Object
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