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Articles on Trending Technologies
Technical articles with clear explanations and examples
Determine whether there is a pair of values in the array where the average of the pair equals to the target average in JavaScript
We are required to write a JavaScript function that takes in an array of sorted integers and a target average as first and second arguments. The function should determine whether there is a pair of values in the array where the average of the pair equals to the target average. There's a solution with O(1) additional space complexity and O(n) time complexity. Since an array is sorted, it makes sense to have two indices: one going from begin to end (say y), another from end to begin of an array (say x). Algorithm Approach The two-pointer ...
Read MoreHow to set cookie value with AJAX request in JavaScript?
When making AJAX requests in JavaScript, you often need to send cookies to the server for authentication or session management. Fortunately, modern browsers automatically include cookies in AJAX requests to the same domain, but you need to set them properly first. How Cookies Work with AJAX AJAX requests automatically send all relevant cookies to the server without additional configuration. The key is setting the cookie correctly using JavaScript's document.cookie property before making your AJAX call. Setting a Basic Cookie Here's how to set a ...
Read MoreSwitching positions of selected characters in a string in JavaScript
We are required to write a JavaScript function that takes in a string containing only the letters 'k', 'l' and 'm'. The task is to switch the positions of 'k' with 'l' while leaving all instances of 'm' at their original positions. Problem Statement Given a string with characters 'k', 'l', and 'm', we need to swap every occurrence of 'k' with 'l' and vice versa, keeping 'm' unchanged. Example Here's the implementation using a simple loop approach: const str = 'kklkmlkk'; const switchPositions = (str = '') => { ...
Read MoreError.prototype.toString() Method in JavaScript
JavaScript's Error.prototype.toString() method is a built-in method that converts error objects to readable string representations. This method is essential for error handling, logging, and debugging in JavaScript applications. Error.prototype.toString() Method The Error.prototype.toString() method converts an error object to a string format. It returns a string containing the error name, followed by a colon and space, then the error message. For example, a standard Error object will produce a string like "Error: something went wrong". Syntax errorObject.toString() Parameters: None Return Value: A string representation of the error object Basic Usage Example Here's ...
Read MoreHow to change the text of a label using JavaScript?
The HTML tag improves web accessibility by providing clickable text descriptions for form elements. In JavaScript, you can dynamically change label text using two properties: innerHTML and innerText. Using the innerHTML Property The innerHTML property allows you to set both text and HTML markup. It's useful when you need to include formatting like bold, italics, or other HTML elements. Syntax selectedElement.innerHTML = "new text with HTML tags"; Example Change Label Text with innerHTML Original label text ...
Read MoreHow to get only first word of object's value – JavaScript?
When working with objects that contain string values with multiple words, you often need to extract only the first word. The most effective approach is using the split() method with a space delimiter. Sample Data Let's work with an employee object containing names and technologies: const employeeDetails = [ { employeeName: "John Smith", employeeTechnology: "JavaScript HTML" }, { employeeName: "David Miller", employeeTechnology: "Java ...
Read MoreReverse alphabetically sorted strings in JavaScript
We are required to write a JavaScript function that takes in a lowercase string and sorts it in the reverse alphabetical order i.e., 'z' should come before 'y', 'b' before 'a', and so on. Example If the input string is: const str = "hello"; Then the output should be: const output = "ollhe"; Using Custom Comparator Function Here's how we can achieve reverse alphabetical sorting using a custom comparator: const string = 'hello'; const sorter = (a, b) => { const legend = ...
Read MoreFinding two numbers that produce equal to the sum of rest in JavaScript
We have a sequence of numbers from 1 to any arbitrary number. We need to find pairs of numbers (m and n) from this sequence such that the sum of all remaining numbers equals the product of these two numbers. Problem Statement Given a number num, find all pairs [m, n] where: sum(1 to num) - (m + n) = m * n For example, if num = 10: Sum of 1 to 10 = 55 For pair [6, 7]: 55 - (6 + 7) = 42 and 6 × 7 = 42 ...
Read MoreFinding smallest sum after making transformations in JavaScript
We need to write a JavaScript function that takes an array of positive integers and applies transformations until no more are possible. The transformation rule is: if arr[i] > arr[j], then arr[i] = arr[i] - arr[j]. After all transformations, we return the sum of the array. Problem The key insight is that this transformation process eventually reduces all numbers to their Greatest Common Divisor (GCD). When we repeatedly subtract smaller numbers from larger ones, we're essentially performing the Euclidean algorithm. if arr[i] > arr[j] then arr[i] = arr[i] - arr[j] How It Works ...
Read MoreError: Permission denied to access property 'target' in JavaScript
"Error − Permission denied to access property 'target'" is a common error message that occurs when working with JavaScript, especially when attempting to access the target property of an event object. This error occurs when a script tries to access a property or method of an object that it does not have permission to access. In this tutorial, we will discuss the causes of this error and how to fix it. Understanding the Error The "Error − Permission denied to access property 'target'" is typically caused by the use of the target property of an event object in ...
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