We are required to write a JavaScript function that takes in an array of numbers that contains at least one duplicate pair of numbers.Our function should return the distance between all the duplicate pairs of numbers that exist in the array.The code for this will be −const arr = [2, 3, 4, 2, 5, 4, 1, 3]; const findDistance = arr => {    var map = {}, res = {};    arr.forEach((el, ind) => {       map[el] = map[el] || [];       map[el].push(ind);    });    Object.keys(map).forEach(el => {       if (map[el].length > ... Read More

Suppose, we have a string that contains words separated by hyphens like this −const str = 'this-is-an-example';We are required to write a JavaScript function that takes in one such string and converts it into a camelCase string.For the above string, the output should be −const output = 'thisIsAnExample';The code for this will be −const str = 'this-is-an-example'; const changeToCamel = str => {    let newStr = '';    newStr = str    .split('-')    .map((el, ind) => {       return ind && el.length ? el[0].toUpperCase() + el.substring(1)       : el;    })    .join('');    return newStr; }; console.log(changeToCamel(str));Following is the output on console −thisIsAnExample

We are required to write a JavaScript function that takes in an array of Numbers as the first argument and a Number as the second argument.The function should return an array of two numbers from the original array whose sum is closest to the number provided as the second argument.The code for this will be −const arr = [1, 2, 3, 4, 5, 6, 7]; const num = 14; const closestPair = (arr, sum) => {    let first = 0, second = 0;    for(let i in arr) {       for(let j in arr) {     ... Read More

Suppose, we have an array of objects like this −const arr = [    {a:1, b:"apples"},    {a:3, b:"apples"},    {a:4, b:"apples"},    {a:1, b:"bananas"},    {a:3, b:"bananas"},    {a:5, b:"bananas"},    {a:6, b:"bananas"},    {a:3, b:"oranges"},    {a:5, b:"oranges"},    {a:6, b:"oranges"},    {a:10, b:"oranges"} ];We are required to write a JavaScript function that takes in one such array and returns an array of objects.The array should contain an object for each unique value of "b" property where the "a" property has the highest value.The code for this will be −const arr = [    {a:1, b:"apples"},    {a:3, ... Read More

We are required to write a JavaScript function that takes in a two-dimensional array and returns its transposed array.The code for this will be −Method 1: Using Array.prototype.forEach()const arr = [    [0, 1],    [2, 3],    [4, 5] ]; const transpose = arr => {    const res = [];    arr.forEach((el, ind) => {       el.forEach((elm, index) => {          res[index] = res[index] || [];          res[index][ind] = elm;       });    });    return res; }; console.log(transpose(arr));Method 2: Using Array.prototype.reduce()const arr = [   ... Read More

We are required to write a JavaScript function that takes in a hexadecimal color and returns its RGB representation.The function should return an object containing the respective values of red green and blue color −For example:hexToRgb('#0080C0') should return 0, 128, 192The code for this will be −const hex = '#0080C0'; const hexToRGB = hex => {    let r = 0, g = 0, b = 0;    // handling 3 digit hex    if(hex.length == 4){       r = "0x" + hex[1] + hex[1];       g = "0x" + hex[2] + hex[2];       ... Read More

We are required to write a JavaScript function that takes in a RGB color and returns its hexadecimal representation.The function should take in an object containing three numbers representing the respective values of red green and blue color.For example:rgbToHex(0, 128, 192) should return '#0080C0'The code for this will be −const rgbColor = {    red: 0,    green: 51,    blue: 155 } function rgbToHex({    red: r,    green: g,    blue: b }) {    const prefix = '#';    const hex = prefix + ((1

Let’s say the following is our string with forward slash −var queryStringValue = "welcome/name/john/age/32"To replace before first forward slash, use replace() along with regular expressions.ExampleFollowing is the code −var regularExpression = /^[^/]+/ var queryStringValue = "welcome/name/john/age/32" var replacedValue = queryStringValue.replace(regularExpression, 'index'); console.log("Original value="+queryStringValue); console.log("After replacing the value="+replacedValue);To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo245.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo245.js Original value=welcome/name/john/age/32 After replacing the value=index/name/john/age/32Read More

The onclick event is a useful feature for calling a function in JavaScript. The onclick event allows you to execute a function when a user interacts with an element, such as clicking a button. This article will guide you on how to use the onclick event to call a JavaScript function. What is Onclick Event? The onclick event is triggered when a user clicks on an HTML element. It is commonly used to execute a JavaScript function or a block of code in response to a mouse click on an HTML element, such as a button, link, or any ... Read More

Let’s say the following is our object −const employeeDetails = [    {       employeeName: "John Smith",       employeeTechnology: "JavaScript HTML"    },    {       employeeName: "David Miller",       employeeTechnology: "Java Angular"    } ]You can use split() on the basis of space.ExampleFollowing is the code −const employeeDetails = [    {       employeeName: "John Smith",       employeeTechnology: "JavaScript HTML"    },    {       employeeName: "David Miller",       employeeTechnology: "Java Angular"    } ] const objectValues = employeeDetails.map(emp => {    var ... Read More