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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 More
NavigableMap is an extension of the SortedMap collection framework. It is used to arrange the elements in a uniform fashion. NavigableMap has different methods to iterate over the elements in the Map.ExampleFollowing is an example − Live Demoimport java.util.NavigableMap; import java.util.TreeMap; public class Demo { public static void main(String[] args) { NavigableMap my_map = new TreeMap(); my_map.put("A", 856); my_map.put("M", 349); my_map.put("Z", 567); System.out.printf("The descending set is : %s%n", my_map.descendingKeySet()); System.out.printf("The floor entry is : %s%n", my_map.floorEntry("A")); System.out.printf("The first key ... Read More
For this, extract the time of specific date time and call the function using setTimeout(). The code is as follows −Example Live Demo Document function timeToAlert() { alert("The time is 9:36 AM"); } var timeIsBeing936 = new Date("08/09/2020 09:36:00 AM").getTime() , currentTime = new Date().getTime() , subtractMilliSecondsValue = timeIsBeing936 - currentTime; setTimeout(timeToAlert, subtractMilliSecondsValue); 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 −
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
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
For reaching the back page on button click, use the concept of −window.history.go(-1)Example Live Demo Document 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 −After clicking the button “Click the button to Goto the Previous Page....”, you will reach the previous page as in the below screenshot −
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 More
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 More
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 More
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