Let’s say the following is our array −var values = [7,5,3,8,9,'/',9,5,8,2,'/',3,4,8];To merge specific elements, use map along with split().ExampleFollowing is the code −var values = [7,5,3,8,9,'/',9,5,8,2,'/',3,4,8]; var afterMerge = values.join('') .split(/(\d+)/). filter(Boolean). map(v => isNaN(v) ? v : +v); console.log(afterMerge);To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo301.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo301.js [ 75389, '/', 9582, '/', 348 ]

For this, you can use ternary operator based on some condition.ExampleFollowing is the code −const yearRangeValue = 18; const getCorrectCentury = dateValues => {    var [date, month, year] = dateValues.split("-");    var originalYear = +year > yearRangeValue ? "20" + year : "18" + year;    return new Date(date + "-" + month + "-" + originalYear).toLocaleDateString('en-GB') }; console.log(getCorrectCentury('10-JAN-19'));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo300.js.OutputThis will produce the following output on console −PS C:\Users\Amit\javascript-code> node demo300.js 1/10/2019

The get keyword can be used as a getter function like C#, Java and other technologies.We set a function with get like the following in a class −class Employee {    constructor(name) {    this.name = name;    }    get fullName() {       return this.name;    } }ExampleFollowing is the code displaying an example of get −class Employee {    constructor(name) {       this.name = name;    }    get fullName() {       return this.name;    } } var employeeObject = new Employee("David Miller"); console.log(employeeObject.fullName);To run the above program, you need to use ... Read More

We are required to write a JavaScript function that takes in two 2-D arrays of numbers and returns their matrix multiplication result.Let’s say the following are our two matrices −// 5 x 4 let a = [    [1, 2, 3, 1],    [4, 5, 6, 1],    [7, 8, 9, 1],    [1, 1, 1, 1],    [5, 7, 2, 6] ]; // 4 x 6 let b = [    [1, 4, 7, 3, 4, 6],    [2, 5, 8, 7, 3, 2],    [3, 6, 9, 6, 7, 8],    [1, 1, 1, 2, 3, 6] ];ExampleLet’s ... Read More

We are required to write a JavaScript function that takes in a string and any number of characters specified as separators. Our function should return a splitted array of the string based on all the separators specified.For example −If the string is −const str = 'rttt.trt/trfd/trtr, tr';And the separators are −const sep = ['/', '.', ', '];Then the output should be −const output = [ 'rttt', 'trt', 'trfd', 'trtr' ];ExampleFollowing is the code −const str = 'rttt.trt/trfd/trtr, tr'; const splitMultiple = (str, ...separator) => {    const res = [];    let start = 0;    for(let i = 0; ... Read More

Given an array of integers, we are required to write a function that takes this array and finds the one element that appears an odd number of times. There will always be only one integer that appears an odd number of times.We will approach this problem by sorting the array. Once sorted, we can iterate over the array to pick the element that appears for odd number of times.ExampleFollowing is the code −const arr = [20, 1, -1, 2, -2, 3, 3, 5, 5, 1, 2, 4, 20, 4, -1, -2, 5]; const findOdd = arr => {    let ... Read More

Let’s say the following is our string. Some text is surrounded by special character hash(#) −var values = "My Name is #yourName# and I got #marks# in JavaScript subject";We need to replace the special character with valid values. For this, use replace() along with shift().ExampleFollowing is the code −var values = "My Name is #yourName# and I got #marks# in JavaScript subject"; const originalValue = ["David Miller", 97]; var result = values.replace(/#([^#]+)#/g, _ => originalValue.shift()); console.log(result);To run the above program, you need to use the following command −node fileName.js. Here, my file name is demo298.js.OutputThis will produce the following output ... Read More

The HTML input value is a string. To convert the string to integer, use parseInt().ExampleFollowing is the code − Live Demo            Document        GetANumber    function result() {       var numberValue = document.getElementById("txtInput").value;       if (!isNaN(numberValue))          console.log("The value=" + parseInt(numberValue));       else          console.log("Please enter the integer value..");    } To run the above program, save the file name “anyName.html(index.html)”. Right click on the file and select the option “Open with ... Read More

Let’s say the following is our object −var details = {    "STUDENTNAME": "John",    "STUDENTAGE": 21,    "STUDENTCOUNTRYNAME": "US" }As you can see above, the keys are in capital case. We need to turn all these keys to lower case. Use toLowerCase() for this.ExampleFollowing is the code −var details = {    "STUDENTNAME": "John",    "STUDENTAGE": 21,    "STUDENTCOUNTRYNAME": "US" } var tempKey, allKeysOfDetails = Object.keys(details); var numberOfKey = allKeysOfDetails.length; var allKeysToLowerCase = {} while (numberOfKey--) {    tempKey = allKeysOfDetails[numberOfKey];    allKeysToLowerCase[tempKey.toLowerCase()] = details[tempKey]; } console.log(allKeysToLowerCase);To run the above program, you need to use the following command −node ... Read More

Let’s say the following is our table −           StudentName       StudentCountryName               JohnDoe       UK               DavidMiller       US     To get id from tr tag and display it in a new td, use document.querySelectorAll(table tr).ExampleFollowing is the code − Live Demo            Document    td,    th,    table {       border: 1px solid black;       margin-left: 10px;       ... Read More