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Let’s say the following is our array −var numbers = [10, 3, 40, 50, 20, 30, 100]We need to search two numbers from the above array elements, whose sum is 80.For this, use simple for loop with if condition.Examplefunction specificPairsOfSumOfTwoNumbers(numbers, totalValue) { var storeTwoNumbersObject = {} for(var currentNumber of numbers) { if(storeTwoNumbersObject[currentNumber]) { return { firstNumber: totalValue-currentNumber, secondNumber:currentNumber} } ... Read More
Let’s say the following is our JSON array −var details = [ { "customerDetails": [ { "customerName": "John Smith", "customerCountryName": "US" } ] }, { "customerDetails": [ { "customerName": "David Miller", "customerCountryName": "AUS" } ] }, { ... Read More
To make addEventListener() repeatedly work on button clicks, use the following code −Example Live Demo Document Click Me var eventValue = function (event) { document.body.appendChild(document.createElement('div')) .textContent = event.type; } var pressed = document.querySelector("#pressButtonDemo"); pressed.addEventListener("click", eventValue); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −When you click the button “Click Me” then you will get ... Read More
Let’s say the following is our array with elements preceded by a + sign −var studentNames = [ '+John Smith', '+David Miller', '+Carol Taylor', '+John Doe', '+Adam Smith' ];To remove the + sign, the code is as follows −ExamplestudentNames = [ '+John Smith', '+David Miller', '+Carol Taylor', '+John Doe', '+Adam Smith' ]; console.log("The actual array="); console.log(studentNames); studentNames = studentNames.map(function (value) { return value.replace('+', ''); }); console.log("After removing the + symbol, The result is="); console.log(studentNames);To run the above program, you need to use the following command −node fileName.js.Here my file ... Read More
Let’s say the following is our button −Sum We are calling the function addTheValue(10) with parameter 10 on button click. On clicking the button, we are adding the value 10 as in the below code −Example Live Demo Document Adding 10 each time whenever you click the Sum Button...... 10 Sum function addTheValue(secondValue) { var fValue = document.getElementById("firstValue"); firstValue.innerHTML = parseInt(fValue.innerHTML) + parseInt(secondValue); } To run the above program, save the file ... Read More
Let’s say the following is our dropdown (select) − John Mike Sam David Carol Following is the code to get the length of list options in JavaScript −Example Live Demo Document John Mike Sam David Carol var lengthOfListOptions = $("#lengthListOfOptionDemo option").length; console.log("The length is=" + lengthOfListOptions); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
We are given an integer array and the task is to count the total number of pairs that can be formed using the given array values such that the OR operation on the pairs will result in the value less than MAX value in the given pair.The truth table for OR operation is given belowABAVB000101011111Input − int arr[] = {2, 5, 1, 8, 9}Output − Count of pairs with bitwise OR less than Max are − 3Explanation −XYX V Y257>5=FALSE213>2=FALSE2810>8=FALSE2911>9=FALSE515=5 TRUE5813>8=FALSE5913>9=FALSE189>8=FALSE1910>9=FALSE899=9= TRUEApproach used in the below program is as followsInput an array of integer elements to form an pairCalculate the ... Read More
Let’s say the following is our array −var details = [ {subjectId:110, subjectName: 'Java' }, {subjectId:111, subjectName: 'Javascript' }, {subjectId:112, subjectName: 'MySQL' }, {subjectId:113, subjectName: 'MongoDB' } ];Now, use the concept of map(). The code is as follows −Examplevar details = [ {subjectId:110, subjectName: 'Java' }, {subjectId:111, subjectName: 'JavaScript' }, {subjectId:112, subjectName: 'MySQL' }, {subjectId:113, subjectName: 'MongoDB' } ]; var output = details.map((detailsObject, index) => { var tempObject = {}; tempObject.subjectId= detailsObject.subjectId; tempObject.subjectName = detailsObject.subjectName; const getThePreviousObject = index != 0 ? details[index-1] : null; tempObject.previousSubjectName = ... Read More
The requirements here are simple, we are required to write a JavaScript function that takes in a number and returns the number of digits in it.For example −The number of digits in 4567 is 4 The number of digits in 423467 is 6 The number of digits in 457 is 3Let's write the code for this function −Exampleconst num = 2353454; const digits = (num, count = 0) => { if(num){ return digits(Math.floor(num / 10), ++count); }; return count; }; console.log(digits(num)); console.log(digits(123456)); console.log(digits(53453)); console.log(digits(5334534534));OutputThe output in the console will be −7 6 5 10
We are required to write a JavaScript function that takes in an array of Numbers and returns a new array with elements as the sum of two consecutive elements from the original array.For example, if the input array is −const arrayOne = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];Then the output should be −const newArrayOne = [1, 5, 9, 13, 17]Let's write the code for this function −Exampleconst arrayOne = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; const doubleSum = arr => { const res = []; for(let i = 0; i < arr.length; i += 2){ res.push(arr[i] + (arr[i+1] || 0)); }; return res; }; console.log(doubleSum(arrayOne));OutputThe output in the console will be −[ 1, 5, 9, 13, 17 ]