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We can check if an element exists with Selenium webdriver. There are multiple ways to achieve this. We can introduce a try / except block. In the except block, we shall throw the NoSuchElementException in case the element does not exist on the page.We can also verify if an element is present in the page, with the help of find_elements() method. This method returns a list of matching elements. We can get the size of the list with the len method. If the len is greater than 0, we can confirm that the element exists on the page.Examplefrom selenium import webdriver ... Read More
We are required to write a JavaScript function that takes in a number and returns the first prime number that appears after n.For example: If the number is 24,Then the output should be 29ExampleFollowing is the code −const num = 24; const isPrime = n => { if (n===1){ return false; }else if(n === 2){ return true; }else{ for(let x = 2; x < n; x++){ if(n % x === 0){ return false; } } return true; }; }; const nearestPrime = num => { while(!isPrime(++num)){}; return num; }; console.log(nearestPrime(24));OutputFollowing is the output in the console −29
An array of numbers is 100% shuffled if no two consecutive numbers appear together in the array (we only consider the ascending order case here). And it is 0% shuffled if pairs are of consecutive numbers.For an array of length n there will be n-1 pairs of elements (without distorting its order).We are required to write a JavaScript function that takes in an array of numbers and returns a number between [0, 100] representing the intensity of shuffle in the arrayExampleFollowing is the code −const arr = [4, 23, 1, 23, 35, 78, 4, 45, 7, 34, 7]; // this function calculates deviation from ascending sort const shuffleIntensity = arr => { let inCorrectPairs = 0; if(arr.length
We are required to write a JavaScript function that takes in a number n and returns a random string of length n containing no other than the 26 English lowercase alphabetsExampleLet us write the code for this function −const num = 8; const randomNameGenerator = num => { let res = ''; for(let i = 0; i < num; i++){ const random = Math.floor(Math.random() * 27); res += String.fromCharCode(97 + random); }; return res; }; console.log(randomNameGenerator(num));OutputFollowing is the output in the console −kdcwpingNote − This is one of many possible outputs. Console output is expected to differ every time/
We are required to write a JavaScript function that takes in a number n as the only input.The function should first find the current day (using Date Object in JavaScript) and then the function should return the day n days from today.For example −If today is Monday and n = 2, Then the output should be −WednesdayExampleFollowing is the code −const num = 15; const findNthDay = num => { const weekday=new Array(7); weekday[1]="Monday"; weekday[2]="Tuesday"; weekday[3]="Wednesday"; weekday[4]="Thursday"; weekday[5]="Friday"; weekday[6]="Saturday"; weekday[7]="Sunday" const day = new Date().getDay(); const daysFromNow = num % ... Read More
We are required to write a JavaScript function that takes in an array of Number / String literals and returns another array of arrays. With each subarray containing exactly two elements, the nth element from start nth from last.For example −If the array is −const arr = [1, 2, 3, 4, 5, 6];Then the output should be −const output = [[1, 6], [2, 5], [3, 4]];ExampleFollowing is the code −const arr = [1, 2, 3, 4, 5, 6]; const edgePairs = arr => { const res = []; const upto = arr.length % 2 === 0 ? arr.length ... Read More
IntroductionThere is a peculiar behaviour of finally block when either try block or catch block (or both) contain a return statement. Normally return statement causes control of program go back to calling position. However, in case of a function with try /catch block with return, statements in finally block are executed first before returning.ExampleIn following example, div() function has a try - catch - finally construct. The try block without exception returns result of division. In case of exception, catch block returns error message. However, in either case statement in finally block is executed first.Example Live DemoOutputFollowing output is displayedThis block ... Read More
IntroductionCode in finally block will always get executed whether there is an exception in ry block or not. This block appears either after catch block or instead of catch block.catch and finally blockIn following example, both catch and finally blocks are given. If execption occurs in try block, code in both is executed. If there is no exception, only finally block is executed.Example Live DemoOutputFollowing output is displayedCaught exception: Division by zero. This block is always executed Execution continueschange statement in try block so that no exception occursExample Live DemoOutputFollowing output is displayed2 This block is always executed Execution continuesfinally block onlyFollowing ... Read More
We can check if an alert exists with Selenium webdriver. An alert is created with the help of Javascript. We shall use the explicit wait concept in synchronization to verify the presence of an alert.Let us consider the below alert and check its presence on the page. There is a condition called alertIsPresent which we will use to check for alerts. It shall wait for a specified amount of time for the alert after which it shall throw an exception.We need to import org.openqa.selenium.support.ui.ExpectedConditions and import org.openqa.selenium.support.ui.WebDriverWait to incorporate expected conditions and WebDriverWait class.Exampleimport org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import ... Read More
IntroductionException class implements Throwable interface and is base class for all Exception classes, predefined exceptions as well as user defined exceptions. The Exception class defines some final (non-overridable) methods to implement those from Throwable interface, and __tostring() method that can be overridden to return a string representation of Exception object.final public function getMessage()message of exceptionfinal public function getCode()code of exceptionfinal public function getFile()source filenamefinal public function getLine()source linefinal public function getTrace()an array of the backtrace()final public function getPrevious()previous exceptionfinal public function getTraceAsString()formatted string of tracepublic function __toString()formatted string for displayIf user defined exception class re-defines the constructor, it should call parent::__construct() to ensure ... Read More