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Found 6686 Articles for Javascript
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
310 Views
Let’s say the following is our string”var stringValue="453.000.00.00.0000";To convert the above string with zeroes to number, use parseInt() along with replace() −var numberValue = parseInt(stringValue.replace(/\./gm, '')); ExampleFollowing is the complete code −var stringValue="453.000.00.00.0000"; var numberValue = parseInt(stringValue.replace(/\./gm, '')); console.log("Original value="+stringValue) console.log("After modification the value="+numberValue);To run the above program, use the following command −node fileName.js. Here, my file name is demo239.js.OutputThe output is as follows −PS C:\Users\Amit\javascript-code> node demo239.js Original value=453.000.00.00.0000 After modification the value=45300000000000
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
4K+ Views
Let’s say the following is our string −const keyName = 'username';To set a string as a key for an object, use the [] and pass the string name −const stringToObject = { [keyName]: 'David Miller' };ExampleFollowing is the complete code −const keyName = 'username'; const stringToObject = { [keyName]: 'David Miller' }; console.log("Your String Value="+keyName); console.log("Your Object Value=") console.log(stringToObject);To run the above program, use the following command −node fileName.js.Here, my file name is demo238.js.OutputThe output is as follows −PS C:\Users\Amit\javascript-code> node demo238.js Your String Value=username Your Object Value= { username: 'David Miller' }Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
605 Views
The best way to reduce and merge a collection of objects, use the concept of Object.values() along with reduce().Following is the object −var details = [ { studentId: 10, marks: 75, studentName: "John" }, { studentId: 10, marks: 75, studentName: "John" }, { studentId: 11, marks: 98, studentName: "Bob" } ];ExampleFollowing is the code to reduce and merge −var details = [ { studentId: 10, marks: 75, studentName: "John" }, { studentId: 10, marks: 75, studentName: "John" }, { studentId: 11, marks: 98, studentName: "Bob" } ]; output = Object.values(details.reduce((value, object) => { ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
414 Views
Let’s say the following are our time data −var startHour = dayjs().hour(10) var endHour = dayjs().hour(22)To get the difference, use the diff() method −ExampleFollowing is the code − Live Demo Document var startHour = dayjs().hour(10) var endHour = dayjs().hour(22) console.log("The hours difference is=" + endHour.diff(startHour, "hours")); To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −OutputThe output is as follows −
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
429 Views
Let’s say the following are ourrinput type checkbox −John David We want to check any of the checkbox. Use the checked property to check the checkbox.ExampleFollowing is the code − Live Demo Document John David document.querySelector('#checkedValue2').checked = true To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −OutputThe output is as follows −
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
814 Views
Let’s say the following are our values −'6778922' '76633 56 1443' '8888 4532 3232 9999'We want the preceding characters to be replaced with 4 asterisks and the display rest of the last 3 characters. The output should be −**** 922 **** 443 **** 999For such conditions, use the replace() and set regex in it.ExampleFollowing is the code −const hideDataWithDot = value => value.replace(/.+(.{3})$/, "**** $1"); console.log(hideDataWithDot('6778922')) console.log(hideDataWithDot('76633 56 1443')) console.log(hideDataWithDot('8888 4532 3232 9999')) To run the above program, use the following command −node fileName.js. Here, my file name is demo236.js.OutputThe output is as follows −PS C:\Users\Amit\javascript-code> node demo236.js **** ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
7K+ Views
Let’s say the following is our string with comma and whitespace −var sentences = " John , David , Bob , Mike, Carol ";To split the sentences by comma, use split(). For removing surrounding spaces, use trim().ExampleFollowing is the code −var sentences = " John , David , Bob , Mike, Carol "; console.log("The value=" + sentences); var result = sentences.split(", ").map(function (value) { return value.trim(); }); console.log("After modifying the value=") console.log(result);To run the above program, use the following command −node fileName.js.Here, my file ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
136 Views
Let’s say the following is our array with duplicate elements −var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000];We want the output to be −[10, 20, 100, 40, 1000];To display only the unique elements, use the concept of filter.ExampleFollowing is the code −var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000]; console.log("With Duplicates Values="); console.log(duplicateNumbers); var noDuplicateNumbersArray = duplicateNumbers.filter(function (value, index, array) { return array.indexOf(value) === index; } ); console.log("Without Duplicates Values=") console.log(noDuplicateNumbersArray);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo234.js.OutputThe output is as ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
291 Views
This is the concept of Bubble Sort. It compares to adjacent element if it is lesser it will swap the value.ExampleFollowing is the code −var numbers = [10, 100, 30, 40, 90, 4, 91, 56, 78]; function bubbleSorting(numbers) { for (var outer = 0; outer < numbers.length; outer++) { for (var inner = 0; inner < numbers.length; inner++) { if (numbers[outer] < numbers[inner]) { var temp = numbers[outer]; numbers[outer] = numbers[inner]; numbers[inner] = temp; ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
477 Views
For this, you can use for loop along with if condition. Let’s say the following is our array −var numbers = [1, 2, 34, 56, 78, 90, 100, 110, 40, 70, 67, 77, 34, 68, 89, 91, 94];We have set a counter to set a value. This value is set to display a fixed number of values −var counter = 6;The above shows the result will be 6 values.ExampleFollowing is the code −var numbers = [1, 2, 34, 56, 78, 90, 100, 110, 40, 70, 67, 77, 34, 68, 89, 91, 94]; var counter = 6; var newNumbers = []; var start = 0; for (var index = 0; index < numbers.length; index++) { if (index % 2 != 0) { start++; if (start node demo231.js [ 2, 56, 90, 110, 70, 77 ]