Following is the code to override derived properties in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result,    .sample {       font-size: 18px;       font-weight: 500;       color: rebeccapurple;    }    .result {       color: red;    } Override derived properties Before overriding After overriding CLICK HERE Click on the above button to override the above properties    let sampleEle = document.querySelector(".sample");    let resEle ... Read More

Use document.getElementById().innerHTML for this. Following is the JavaScript code −Example Document    function display(){       var storedValue = document.getElementById('getValue').innerHTML.value="This is the       value";       console.log("The value is==="+storedValue);    } To run the above program, 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.Following is the output. When you will click the mouse and place the arrow key, you will get the following output.The snapshot is as follows −

The onchange event triggers when an element changes. You need to use below syntax.onchange="yourFunctionName(this);"Example Live Demo Document Choose Color    function showValue(c){       console.log(c.value);    } To run the above program, 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.OutputAfter clicking the input type color, you will get the color value in console −

Following is the JavaScript code to make a format like ABC-1234 −Example Live Demo Document ABC1234    function joinTheDashSymbol(m, r1,r2,r3,r4,r5) {       if (r1)          return [r1,r2,r3].join('-');       else          return [r4,r5].join('-');    }    $(".formatting").text(function(i, words) {       words = words.replace(/^(\d{3})(\d{3})(\d{4})|([A-Z]{3})(\d{4})$/,       joinTheDashSymbol);       return words;    }); To run the above program, 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.Output

You can use the concept of placeholder. Following is the JavaScript code −Example Live Demo Document    var yourText= "John";    var textBoxSearch = document.getElementById("textSearch");    textBoxSearch.value = yourText;    textBoxSearch.onfocus = function() {       if (this.value == yourText) {          this.value = '';       }    } To run the above program, 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.OutputWhen you click on the search box, the placeholder value will be visible. The snapshot is as follows −

Display in alert by using alert(window()). Following is the syntax −alert(window['yourVariableName' + 'yourVariableName' + otherVariableName]);Example Live Demo Document    var globalVariablelocal_print100=100;    print100=1;    alert(window['globalVariable' + 'local_' + print100]); To run the above program, 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.Output

You can use the concept of value(). Following is the JavaScript code −Example Live Demo Document FirstNumber SecondNumber: Add Two Nnumbers The addition is:    function add() {       var f = parseInt(document.getElementsByName('input1')[0].value);`       var s =parseInt(document.getElementsByName('input2')[0].value);       var result = f+s;       document.getElementsByName('display')[0].value= result;    } To run the above program, 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.OutputOn clicking the button, the value will be displayed in the textbox. The snapshot is as follows −

Following is the code for object de-structuring in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .sample, .result {       font-size: 18px;       font-weight: 500;       color: red;    }    .result {       color: rebeccapurple;    } Object de-structuring in JavaScript. CLICK HERE Click on the above button to destructure the object above    let sampleEle = document.querySelector(".sample");    let resultEle = document.querySelector(".result");    let obj = { ... Read More

The JavaScript Array.prototype.sort() method is used for sorting an array. The order of sorting can be alphabetic, numeric, ascending or descending.Following is the code for the Array.prototype.sort() method −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .sample, .result {       font-size: 18px;       font-weight: 500;       color: red;    }    .result {       color: rebeccapurple;    } JavaScript Array.prototype.sort() method CLICK HERE Click on the above button to sort the ... Read More

The JavaScript Array.prototype.flat() method is used to flatten an array recursively up to a specified depth. It doesn’t manipulate the original array but creates a new flattened array.Following is the code for the Array.prototype.flat() method −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result,.sample {       font-size: 20px;       font-weight: 500;    } Array.prototype.flat() method {       let store = arr.flat(1);       store.forEach((item,index) => {          resEle.innerHTML += index + ' : ' + item + '';       });    }); OutputThe above code will produce the following output −On clicking the ‘CLICK HERE’ button −