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We are required to write a JavaScript function that takes in an array of strings, ordered by ascending length.The function should return true if, for each pair of consecutive strings, the second string can be formed from the first by adding a single letter either at the beginning or end.For example: If the array is given by −const arr = ["c", "ca", "can", "acan", "acane", "dacane"];Then our function should return true.ExampleFollowing is the code −const arr = ["c", "ca", "can", "acan", "acane", "dacane"]; const isProgressive = arr => { for(let i = 0; i < arr.length-1; i++){ ... Read More
IntroductionBlocks of try - catch can be nested upto any desired levels. Exceptions will be handled in reverse order of appearance i.e. innermost exception processing is done first.ExampleIn following example,inner try block checks if either of two varibles are non-numeric, nd if so, throws a user defined exception. Outer try block throws DivisionByZeroError if denominator is 0. Otherwise division of two numbers is displayed.Example Live DemoOutputFollowing output is displayedDivision by 0 in line no 19Change any one of varibles to non-numeric valueerror : Non numeric data in line no 20If both variables are numbers, their division is printed
We can check if an element exists with Selenium webdriver. There are multiple ways to check it. We shall use the explicit wait concept in synchronization to verify the visibility of an element.Let us consider the below webelement and check if it is visible on the page. There is a condition called visibilityOfElementLocated which we will use to check for element visibility. It shall wait for a specified amount of time for the element 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. We will introduce a try/catch ... Read More
We are required to write a function that takes in an array of exactly five elements representing the five cards of a poker player drawn randomly.If the five cards contain at least one pair, our function should return the card number of the highest pair (trivial if there only exists a single pair). Else our function should return false.For example: If the array is −const arr = ['A', 'Q', '3', 'A', 'Q'];Then our function should return −'A' (as 'A' > 'Q' in card games)ExampleFollowing is the code −const arr = ['A', 'Q', '3', 'A', 'Q']; const greatestPair = arr => ... Read More
IntroductionPHP allows a series of catch blocks following a try block to handle different exception cases. Various catch blocks may be employed to handle predefined exceptions and errors as well as user defined exceptions.ExampleFollowing example uses catch blocks to process DivisioByZeroError, TypeError, ArgumentCountError and InvalidArgumentException conditions. There is also a catch block to handle general Exception.Example Live DemoOutputTo begin with, since denominator is 0, Divide by 0 error will be displayedDivision by 0Set $b=3 which will cause TypeError because divide function is expected to return integer but dividion results in floatReturn value of divide() must be of the type integer, float ... Read More
Other than all being a natural number, the numbers 0, 4, 6, 8, 9 have one more thing in common. All these numbers are formed by or contain at least one closed loop in their shapes.For example, the number 0 is a closed loop, 8 contains two closed loops and 4, 6, 9 each contains one closed loop.We are required to write a JavaScript function that takes in a number and returns the sum of the closed loops in all its digits.For example, if the number is 4789Then the output should be 4 i.e.1 + 0 + 2 + 1ExampleFollowing is ... Read More
We are required to write a JavaScript function that takes in a string and returns a new string with the last vowel of each word removed.For example − If the string is −const str = 'This is an example string';Then the output should be −const output = 'Ths s n exampl strng';ExampleFollowing is the code −const str = 'This is an example string'; const removeLast = word => { const lastIndex = el => word.lastIndexOf(el); const ind = Math.max(lastIndex('a'), lastIndex('e'), lastIndex('i'), lastIndex('o'), lastIndex('u')); return word.substr(0, ind) + word.substr(ind+1, word.length); } const removeLastVowel = str => { ... Read More
We are required to write a JavaScript function that takes in two numbers and returns their difference but without using the (-) signExampleFollowing is the code −const num1 = 56; const num = 78; const subtractWithoutMinus = (num1, num2) => { if(num2 === 0){ return num1; }; return subtractWithoutMinus(num1 ^ num2, (~num1 & num2)
IntroductionPrior to version 7, PHP parser used to report errors in response to various conditions. Each error used to be of a certain predefined type. PHP7 has changed the mechanism of error reporting. Instead of traditional error reporting, most errors are now reported by throwing error exceptions.If error exceptions go unhandled, a fatal error is reported and will be handled like traditional error condition. PHP's error heirarchy starts from Throwable interface. All predefined errors such as ArithmeticError, AssertionError, CompileError and TypeError are classes implementing Throwable iterface. Exception in PHP 7 is also implements Throwable interface.Throwable interface acts as base for ... Read More
We are required to write a JavaScript function that takes in an array of literals containing all similar elements but one. Our function should return the unlike number.ExampleFollowing is the code −const arr = [2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4]; // considering that the length of array is atleast 3 const findUnlike = arr => { for(let i = 1; i < arr.length-1; i++){ if(arr[i] - arr[i-1] !== 0 && arr[i]-arr[i+1] === 0){ return arr[i-1]; }else if(arr[i] - arr[i-1] !== 0 && arr[i]-arr[i+1] === ... Read More