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Let’s say the following is our array object −var arrayObject = [ "John", "David", "Mike" ]You can use length property to set the length to 0 and clear memoryThe syntax is as follows to clear memory −yourArrayObjectName.length=0; // To clear memory yourArrayObjectName.length=4; // To allocate memoryOutputThis will produce the following output on console −var arrayObject = [ "John", "David", "Mike" ] arrayObject.length = 0; console.log(arrayObject); arrayObject.length = 5; for (var i = 0; i < arrayObject.length; i++) ... Read More
You can use event listeners for clicks.ExampleFollowing is the code − Live Demo Document First Division Second Division document.addEventListener('click', callEventFuncion) function callEventFuncion(event) { var div = document.querySelectorAll('.divDemo'); var titleResult = document.querySelectorAll('.my-title'); var result = Array.apply(0, div).find((v) => v.contains(event.target)); if (result) { console.log(" Incrementing Division Selection"); } else { ... Read More
For this, use join(). It will concatenate the string value length-1.ExampleFollowing is the code −var count = 5; var values = new Array(count + 1).join('John'); console.log(values); var count1 = 5; var values1 = new Array(count1).join('John'); console.log(values1);To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo274.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo274.js JohnJohnJohnJohnJohn JohnJohnJohnJohn
With Spread Operator, allow the expression to expand to multiple arguments, elements, variables, etc.You can use JSON.stringify() to convert the JavaScript object to string. Here, we have our object as the result of using spread operator on details1 and details2.ExampleFollowing is the code −var details1 = { name: 'John', age: 21 }; var details2 = { countryName: 'US', subjectName:'JavaScript' }; var result= { ...details1, ...details2}; console.log(JSON.stringify(result));To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo267.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo267.js {"name":"John", "age":21, "countryName":"US", "subjectName":"JavaScript"}Read More
To validate a specific URL, use regular expression.ExampleThe code is as follows −function validateSoundURL(myURL) { var regularExpression = /^https?:\/\/(tutorialspoint\.com)\/(.*)$/; return myURL.match(regularExpression) && myURL.match(regularExpression)[2] } console.log(validateSoundURL("https://tutorialspoint.com/index")); console.log(validateSoundURL("https://tutorialspoint.com/java"));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo259.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo259.js index java
Let’s say the following is our fixed element div − Fixed The CSS style to fix the above element −.fixedElement { position: fixed; background-color: skyblue; top: 0; left: 0; right: 0; }Following is our element, which will be scrolled − David Miller Now, use the window.scrollTo().ExampleLet us see the complete code − Live Demo Document .fixedElement { position: fixed; background-color: skyblue; top: 0; left: 0; right: ... Read More
Let’s say the following is our file and we need to read this file using jQuery.The name of the file details −ExampleFollowing is the code − Live Demo Document function chooseFile() { dataFromMyFile = document.getElementById("readFileDemo").files[0]; readDataFromFile = new FileReader(); readDataFromFile.onload = () => { data = readDataFromFile.result; console.log("Your File Data is="); console.log(data); }; readDataFromFile.readAsText(dataFromMyFile); } ... Read More
Let’s say the following is our select − Get First Name Get First Name Only To get only the first word, use split() on the basis of space and can select the 0th index value.ExampleFollowing is the code − Live Demo Document Get First Name Get First Name Only function showFirstValue(choosenObject) { var allValues = choosenObject.value.split(" "); var firstValue = allValues[0]; console.log("The first Name=" + firstValue); } ... Read More
For this, call a function on button click.ExampleFollowing is the code − Live Demo Document ClickMeToCopyURL https://www.tutorialspoint.com/index/ function demoForCopyURL(e) { event.preventDefault(); var rootText = event.target.parentElement.innerText var btnText = event.target.innerText var originalURLValue = rootText.substring(btnText.length + 1) console.log("THE URL IS=" + originalURLValue) } 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 VSCode editor −OutputThis will produce the following output on console −On clicking the button, you will get the following output on console −
There is no such difference between the single quote (‘) and double quote(“) in PowerShell. It is similar to a programming language like Python. We generally use both quotes to print the statements.ExamplePS C:\> Write-Output 'This will be printed using Single quote' This will be printed using Single quote PS C:\> Write-Output "This will be printed using double quote" This will be printed using double quoteBut when we evaluate any expression or print variable it makes a clear difference.$date = Get-Date Write-Output 'Today date is : $date' Today date is : $date Write-Output "Today date is : $date" Today date ... Read More