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Javascript Articles
Page 403 of 534
Count of N-digit Numbers having Sum of even and odd positioned digits divisible by given numbers - JavaScript
We are required to write a JavaScript function that takes in three numbers A, B and N, and finds the total number of N-digit numbers whose sum of digits at even positions and odd positions are divisible by A and B respectively.ExampleLet’s write the code for this function −const indexSum = (num, sumOdd = 0, sumEven = 0, index = 0) => { if(num){ if(index % 2 === 0){ sumEven += num % 10; }else{ sumOdd += num % 10; ...
Read MoreRotating an array - JavaScript
Let’s say, we are required to write a JavaScript function that takes in an array and a number n and rotates the array by n elementsFor example: If the input array is −const arr = [12, 6, 43, 5, 7, 2, 5];and number n is 3, Then the output should be −const output = [5, 7, 2, 5, 12, 6, 43];Let’s write the code for this function −ExampleFollowing is the code −// rotation const arr = [12, 6, 43, 5, 7, 2, 5]; const rotateByOne = arr => { for(let i = 0; i < arr.length-1; i++){ ...
Read MoreHow can I check JavaScript arrays for empty strings?
Let’s say the following is our array with non-empty and empty values −studentDetails[2] = "Smith"; studentDetails[3] = ""; studentDetails[4] = "UK"; function arrayHasEmptyStrings(studentDetails) { for (var index = 0; index < studentDetails.length; index++) {To check arrays for empty strings, the syntax is as follows. Set such condition for checking −if(yourArrayObjectName[yourCurrentIndexvalue]==””){ // insert your statement } else{ // insert your statement }Examplevar studentDetails = new Array(); studentDetails[0] = "John"; studentDetails[1] = ""; studentDetails[2] = "Smith"; studentDetails[3] = ""; studentDetails[4] = "UK"; function arrayHasEmptyStrings(studentDetails) { for (var index = 0; index < studentDetails.length; index++) { if (studentDetails[index] ...
Read MoreHow to check for 'undefined' or 'null' in a JavaScript array and display only non-null values?
Let’s say the following is our array with non-null, null and undefined values −var firstName=["John",null,"Mike","David","Bob",undefined];You can check for undefined or null cases by using the following code −Examplevar firstName=["John",null,"Mike","David","Bob",undefined]; for(var index=0;index node demo203.js John Mike David Bob
Read MoreHow Do I Find the Largest Number in a 3D JavaScript Array?
Let’s say the following is our array;var theValuesIn3DArray = [75, [18, 89], [56, [97], [99]]];Use the concept of flat() within the Math.max() to get the largest number.Examplevar theValuesIn3DArray = [75, [18, 89], [56, [97], [99]]]; Array.prototype.findTheLargestNumberIn3dArray = function (){ return Math.max(...this.flat(Infinity)); } console.log("The largest number in 3D array is="); console.log(theValuesIn3DArray.findTheLargestNumberIn3dArray());To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo202.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo202.js The largest number in 3D array is= 99
Read MoreCheck for illegal number with isNaN() in JavaScript
Following is the code −Examplefunction multiplication(firstValue, secondValue, callback) { var res = firstValue * secondValue; var err = isNaN(res) ? 'Something is wrong in input parameter' : undefined; callback(res, err); } multiplication(10, 50, function (result, error) { console.log("The multiplication result="+result); if (error) { console.log(error); } }); multiplication('Sam', 5, function (result, error) { console.log("The multiplication result="+result); if (error) { console.log(error); } });To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo201.js.OutputThis will produce the following output ...
Read MoreCheck if value of an object of certain class has been altered in JavaScript and update another value based on it?
To check this, use the concept of getter, i.e. the get property. Following is the code −Exampleclass Student{ constructor(studentMarks1, studentMarks2){ this.studentMarks1 = studentMarks1 this.studentMarks2 = studentMarks2 var alteredValue = this; this.getValues = { get studentMarks1() { return alteredValue.studentMarks1 }, get studentMarks2() { return alteredValue.studentMarks2 } } } } var johnSmith = new Student(78, 79) console.log("Before ...
Read MoreHow to move all capital letters to the beginning of the string in JavaScript?
Let’s say following is our string −my name is JOHN SMITHUse sort() along with regular expression /[A-Z]/ to move all capital letters to the beginning of the string/Examplevar moveAllCapitalLettersAtTheBeginning = [...' my name is JOHN SMITH '] .sort((value1, value2) => /[A-Z]/.test(value1) ? /[A-Z]/.test(value2) ? 0 : -1 : 0).join(' '); console.log("After moving the all capital letters at the beginning="); console.log(moveAllCapitalLettersAtTheBeginning);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo199.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo199.js After moving the all capital letters at the beginning= J O H N ...
Read MoreJavaScript outsider function call and return the result
Use the return keyword for outsider function call. Following is the code −Examplevar substractMethod = function () { var firstValue =1000, thirdValue= 200; var divideMethod = function (){ var secondValue =500; console.log("The result of divideMethod()="+(firstValue/secondValue)); return (firstValue-secondValue); } return divideMethod; } var result = subtractMethod(); console.log("The result of substractMethod()="+result());To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo198.js.OutputThis will produce the following output −PS C:\Users\Amit\javascript-code> node demo198.js The result of divideMethod()=2 The result of subtractMethod()=500
Read MoreConvert buffer to readable string in JavaScript?
For this, use the concept of toString(‘utf8’). Following is the code −In the code below, there are detailed explanations about the buffer.Examplevar actualBufferObject = Buffer.from('[John Smith]', 'utf8') console.log("The actual buffer object="); console.log(JSON.stringify(actualBufferObject)) console.log("Get back the original object="); console.log(actualBufferObject.toString('utf8')); var myObjectValue = '[John Smith]'; console.log("The data you are getting from the buffer is equal to ASCII code equivalent...") for (var counter = 0; counter < myObjectValue.length; counter++) { console.log("The ascii value of " + myObjectValue[counter] + " is =" + (myObjectValue.charCodeAt(counter))); }To run the above program, you need to use the following command −node fileName.js.Here, my file name is ...
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