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Front End Technology Articles
Page 182 of 652
Converting whitespace string to url in JavaScript
In web URLs, browsers automatically replace spaces with '%20' for proper encoding. JavaScript provides multiple methods to convert whitespace characters to URL-encoded format. We need to write a function that takes a string and replaces all whitespace characters with '%20'. For example, if the input string is: const str = 'some extra Space'; Then the output should be: const output = 'some%20extra%20%20Space'; Using Manual Loop Method This approach iterates through each character and manually replaces spaces: const str = 'some extra Space'; const replaceWhitespace = (str = ...
Read MoreHow to allocate memory to an object whose length is set to 0 - JavaScript?
In JavaScript, you can manipulate array length to clear memory and allocate new slots. When you set an array's length to 0, it clears all elements. Setting length to a larger value allocates empty slots. Understanding Array Length Property The length property controls how many elements an array can hold. Setting it to 0 removes all elements, while setting it to a larger number creates empty slots filled with undefined. var arrayObject = [ "John", "David", "Mike" ]; console.log("Original array:", arrayObject); console.log("Original ...
Read MoreFinding elements whose successors and predecessors are in array in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the first and the only argument. The function should construct and return a new array that contains all such elements from the original array whose successor and predecessor are both present in the array. This means, if any element num is in the original array, it should be included in the result array if and only if num - 1 and num + 1 are also present in the array. For example, if the input array is: const arr = ...
Read MoreFetch specific values from array of objects in JavaScript?
Fetching specific values from an array of objects is a common JavaScript task. This article demonstrates multiple approaches to filter and extract data based on specific criteria. Sample Data Let's start with an array of employee objects: const details = [ { employeeFirstName: "John", employeeLastName: "Doe" }, { employeeFirstName: "David", employeeLastName: "Miller" ...
Read MoreFinding confusing number within an array in JavaScript
A number in an array is confusing if it becomes another number which is also present in the array after we rotate it by 180 degrees. When rotated, digits transform as follows: 0→0, 1→1, 6→9, 8→8, 9→6. Other digits (2, 3, 4, 5, 7) cannot be rotated to form valid numbers. Understanding Confusing Numbers For a number to be confusing: It must contain only the digits 0, 1, 6, 8, 9 When rotated 180 degrees, it must form a valid number within our range The rotated number must also be present in the array Example ...
Read MoreEnter values with prompt and evaluate on the basis of conditions in JavaScript?
JavaScript's prompt() function allows you to collect user input and evaluate it using conditional statements. This is useful for creating interactive web applications that respond based on user-provided values. Basic Syntax To get user input and convert it to a number: var value = parseInt(prompt("Enter a value")); Example: Conditional Evaluation Based on User Input Here's a complete example that prompts for two values and evaluates their product: Prompt and Evaluate ...
Read MoreChecking digit sum of smallest number in the array in JavaScript
We are required to write a JavaScript function that takes in an array of numbers as the first and the only argument. The function should first pick the smallest number from the array and then calculate the sum of all the digits of the number. If the digit sum of that number is even, we should return true, false otherwise. Problem Example If the input array is: const arr = [12, 657, 23, 56, 34, 678, 42]; Then the output should be: const output = false; Because the smallest ...
Read MoreRemove/ filter duplicate records from array - JavaScript?
JavaScript arrays often contain duplicate records that need to be removed. There are several effective methods to filter duplicates, depending on whether you're working with primitive values or objects. Sample Data with Duplicates Let's start with an array of nationality objects containing duplicate values: var objectOfNationality = [ { nationality: "Indian" }, { nationality: "American" }, { nationality: "Emirati" }, { nationality: "Indian" }, { nationality: "American" } ]; console.log("Original array:", objectOfNationality); ...
Read MoreFinding the maximum number using at most one swap in JavaScript
We are required to write a JavaScript function that takes in a number as the first and the only argument. The task of our function is to perform at most one swap between any two digits of the number and yield the maximum possible number. If the number is already the maximum possible number, we should return the number itself. For example, if the input number is: const num = 1625; Then the output should be: const output = 6125; We swapped 1 and 6, and this is the only ...
Read MoreNumber prime test in JavaScript by creating a custom function?
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. In JavaScript, we can create a custom function to check if a number is prime. Basic Prime Number Function Here's a simple approach to check if a number is prime: function checkNumberIsPrime(number) { if (number
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