Web Development Articles - Page 485 of 1049

The spread operator in function calls enhances the function parameter handling. The spread operator allows you to expand an array or any iterable across zero or more arguments in a function call. This article will guide you on using the spread operator in a function call. The spread operator is a powerful feature of JavaScript that allows one to perform operations for complex and lengthy code in a simple single line of code. The spread operator is denoted by the (...) (triple dot) symbol. Syntax The basic syntax of spread operator for function calls is mentioned below: functionName(...iterableObject) ... Read More

An object initializer is an expression that allow us to initialize a newly created object. It is a comma-separated list of zero or more pairs of property names and associated values of an object enclosed in a pair of curly braces {}.Following is the code for object initializer in JavaScript.Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;       color: blueviolet;    } Object initializer in JavaScript ... Read More

Following is the code for accessing an array returned by a function in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;       color: blueviolet;    } Accessing an array returned by a function in JavaScript CLICK HERE Click on the above button to return an array from retTable() function and access it    let resEle = document.querySelector(".result");    let BtnEle = document.querySelector(".Btn");    function retTable(num) {       let tempNum = [];       for (i = 1; i {       let tableArr = retTable(5);       resEle.innerHTML = "tableArr = " + tableArr;    }); OutputOn clicking the ‘CLICK HERE’ button −

The loose equality operator ‘==’ allows us to compare two or more operands by converting their value to a common type first and then checking for the equality between them.strict equality operator ‘===’ allows us to compare two or more operands by checking the equality between the values as well as their types . It returns true only if the values and the type both match with the other operand.Following is the code for loose equality vs strict equality in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, ... Read More

The loose equality operator ‘==’ allows us to compare two or more operands by converting their value to a common type first and then checking for the equality between them.Following is the code to implement loose equality in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;       color: blueviolet;    } Loose equality in JavaScript. CLICK HERE Click on the above button see some ... Read More

The accessor property helps us in implementing getter and setter functions in JavaScript.They execute a function on getting or setting a value.There are four attributes of an accessor property −get − It gets called when a property is read. It doesn’t’ take any arguments/set − It gets called when a property is set. It takes only one argument.enumerable − Allows the object to be iterable when set to true.configurable − When set to false it will not allow to delete the property or change its values.Following is the code for accessor property and its attributes −Example Live Demo ... Read More

Following is the code for renaming imports and exports in JavaScript −Note − You need to run a localhost server to run this example.Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 18px;       font-weight: 500;       color: rebeccapurple;    } Renaming imports and exports in JavaScript CLICK HERE Click on the above button to execute the imported function script.jsimport {test, tellTime as showTime} from "./sample.js"; let resultEle = ... Read More

Following is the code for loading JavaScript modules dynamically −Note − You need to run a localhost server to run this example.Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 18px;       font-weight: 500;    } Loading JavaScript modules dynamically IMPORT Click on the above button to import module script.jsimport test from './sample.js'; document.querySelector('.Btn').addEventListener('click',()=>{    test(); })sample.jslet resultEle = document.querySelector(".result"); export default function testImport(){    resultEle.innerHTML = 'Module testImport has been imported'; }OutputOn clicking the ‘IMPORT’ button −

Keyed collections are data collections that are ordered by key not index. They are associative in nature. Map and set objects are keyed collections and are iterable in the order of insertion.Following is the code for keyed collections in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;       color: blueviolet;    } Keyed collections in JavaScript CLICK HERE Click on the above button to ... Read More

Arrays are the indexed collection in JavaScript as they allow us to access an element using its index.Following is the code to implement indexed collections in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;       color: blueviolet;    } Indexed collections in JavaScript CLICK HERE Click on the above button to create and display the array    let resEle = document.querySelector(".result");    let BtnEle = document.querySelector(".Btn");    BtnEle.addEventListener("click", () => {       let arr = [1, 2, 3, 4, 5];       arr.forEach((item, index) => {          resEle.innerHTML += `arr[${index}] = ${item} `;       });    }); OutputOn clicking the ‘CLICK HERE’ button −