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Articles by AmitDiwan
Page 427 of 840
Convert JavaScript array iteration result into a single line text string
Let's say we have a string and an array of keywords to search for: const textString = 'Convert javascript array iteration result into a single line text string. Happy searching!'; const keywords = ['integer', 'javascript', 'dry', 'Happy', 'exam']; We need to write a function that maps the array to a string containing only true and false values, depending on whether each array element is present in the string or not. Solution Using reduce() and join() The most efficient approach uses reduce() to build an array of boolean values, then join() to convert it into ...
Read MoreCan array form consecutive sequence - JavaScript
We are required to write a JavaScript function that takes in an array of numbers and checks if the elements of the array can be rearranged to form a sequence of consecutive numbers or not. For example, if we have an array [3, 1, 4, 2, 5], these numbers can be rearranged as [1, 2, 3, 4, 5] to form a consecutive sequence. Problem Understanding A consecutive sequence means each number is exactly 1 more than the previous number. To check this, we need to: Sort the array in ascending order ...
Read MoreHide div that contains specific text with JavaScript?
In JavaScript, you can hide div elements containing specific text by using getElementsByClassName() to select elements, then iterating through them and checking their content. When a match is found, set the element's display style to 'none'. Basic Approach The process involves three main steps: Get all div elements with a specific class Loop through each element and check its text content Hide matching elements by setting display: none Example: Hide Divs with Specific Text Hide ...
Read MoreJavaScript example to filter an array depending on multiple checkbox conditions.
Following is the code to filter an array depending on multiple checkbox conditions using JavaScript. This example demonstrates how to apply cumulative filters based on user checkbox selections. Example Array Filter with Multiple Checkboxes body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; ...
Read MoreAppend the current array with the squares of corresponding elements of the array in JavaScript
We have an array of Numbers like this: const arr = [12, 19, 5, 7, 9, 11, 21, 4]; We have to write a function that takes in such an array and returns a new array with all the items of the original array appended by the squares of corresponding elements of the array. For this sample array, the output should be: [12, 19, 5, 7, 9, 11, 21, 4, 144, 361, 25, 49, 81, 121, 441, 16] Method 1: Using reduce() The reduce() method can accumulate the original array ...
Read MoreSeparate a string with a special character sequence into a pair of substrings in JavaScript?
When you have a string containing a special character sequence that acts as a delimiter, you can separate it into substrings using JavaScript's split() method with regular expressions. Problem Statement Consider this string with a special character sequence: " John Smith " We need to split this string at the delimiter and get clean substrings without extra whitespace. Syntax var regex = /\s*\s*/g; var result = string.trim().split(regex); Example var fullName = " John Smith "; console.log("Original string: " + fullName); var regularExpression = ...
Read MoreFinding persistence of number in JavaScript
The additive persistence of a number is the count of times you must repeatedly sum its digits until you get a single digit. This is a common programming problem that demonstrates recursion and digit manipulation. Understanding Additive Persistence For any positive integer, we replace it with the sum of its digits repeatedly until we reach a single digit (0-9). The number of iterations required is the additive persistence. For example, with 1679583: 1679583 → 1+6+7+9+5+8+3 = 39 (Pass 1) 39 → 3+9 = 12 ...
Read MoreHow to convert dictionary into list of JavaScript objects?
In JavaScript, you can convert a dictionary (object) into a list of objects using various methods. The most common approaches are Object.values(), Object.entries(), and Object.keys() with mapping. What is a Dictionary in JavaScript? A dictionary in JavaScript is typically an object with key-value pairs where values can be primitives, arrays, or other objects. Dictionary to List Conversion Convert Dictionary to List of Objects Convert Dictionary ...
Read MoreAdding only odd or even numbers JavaScript
We are required to make a function that given an array of numbers and a string that can take any of the two values "odd" or "even", adds the numbers which match that condition. If no values match the condition, 0 should be returned. For example: conditionalSum([1, 2, 3, 4, 5], "even") => 6 conditionalSum([1, 2, 3, 4, 5], "odd") => 9 conditionalSum([13, 88, 12, 44, 99], "even") => 144 conditionalSum([], "odd") => 0 Using Array.reduce() Method We'll use the Array.prototype.reduce() method to iterate through the array and sum numbers based on the condition: ...
Read MoreCheck for Valid hex code - JavaScript
A string can be considered as a valid hex code if it contains no characters other than the 0-9 digits and a-f alphabets (case-insensitive). Hex codes are commonly used in web development for colors, cryptographic hashes, and other applications. For example: '3423ad' is a valid hex code '4234es' is an invalid hex code (contains 'e' and 's') We need to write a JavaScript function that takes in a string and checks whether it's a valid hex code or not. Method 1: Using includes() Method This approach checks each character against a string containing ...
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