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Front End Technology Articles
Page 221 of 652
Generating combinations from n arrays with m elements in JavaScript
We are required to write a JavaScript function that generates combinations from n number of arrays with m number of elements in them. For example, consider this data: const arr = [ [0, 1], [0, 1, 2, 3], [0, 1, 2] ] We have 3 sub-arrays with different numbers of elements. What we want to do is get all combinations by selecting one item from each array. Understanding the Problem The goal is to generate a Cartesian product of multiple arrays. For the example ...
Read MoreHow to create every combination possible for the contents of two arrays in JavaScript
Creating every possible combination from two arrays is known as a Cartesian product. This involves pairing each element from the first array with every element from the second array. Problem Setup Given two arrays of literals: const arr1 = ["A", "B", "C"]; const arr2 = ["1", "2", "3"]; console.log("Array 1:", arr1); console.log("Array 2:", arr2); Array 1: [ 'A', 'B', 'C' ] Array 2: [ '1', '2', '3' ] We need to create all possible combinations by pairing each element from the first array with each element from the second array. ...
Read MoreSeparating digits of a number in JavaScript
In JavaScript, separating digits of a number is a common programming task. This tutorial shows how to extract and display each digit of a number individually using different approaches. Problem Statement We need to create a program that takes a number as input and displays each digit separately. For example, if the input is 43354, the output should be: 4 3 3 5 4 Method 1: Using Mathematical Operations This approach uses the modulo operator (%) and integer division to extract digits from right to left: ...
Read MoreGet the total number of same objects in JavaScript
When working with arrays of objects in JavaScript, you often need to count how many objects share the same property values. This is useful for analyzing data like flight routes, user preferences, or categorizing items. Suppose we have an array of objects describing flight routes: const routes = [ { flyFrom: "CDG", flyTo: "DUB", return: 0, }, { ...
Read MoreSorting parts of array separately in JavaScript
We have an array that contains many objects. We are required to write a function to sort the first half of the array in ascending order and the second half of the array in ascending order as well, but without inter-mixing the entries of halves into one another. Consider this sample array: const arr = [ {id:1, x: 33}, {id:2, x: 22}, {id:3, x: 11}, {id:4, x: 3}, {id:5, x: 2}, {id:6, x: ...
Read MoreJavaScript - Find keys for the matched values as like query in SQL
In JavaScript, you can filter object properties based on value matching, similar to SQL's WHERE clause with LIKE operator. This is useful for searching through data structures and finding keys that match specific criteria. Problem Statement Given an object with key-value pairs, we need to find all keys whose values contain a specific search term (case-insensitive). const obj = { "100": "Jaipur", "101": "Delhi", "102": "Raipur", "104": "Goa" }; We want to create a function that returns ...
Read MoreList all duplicate values in a nested JavaScript object
When working with nested JavaScript objects, you may need to find duplicate values that appear at different levels of nesting. This tutorial shows how to recursively search through a nested object and identify all duplicate values. Problem Statement Consider a nested object containing pet information: const pets = { owner1: 'Frank', owner2: 'Curly', owner3: 'Maurice', dogs: { terriers: { name1: ...
Read MoreSearch by id and remove object from JSON array in JavaScript
Suppose, we have an array of objects that contains data about some movies like this − const arr = [ {id: "1", name: "Snatch", type: "crime"}, {id: "2", name: "Witches of Eastwick", type: "comedy"}, {id: "3", name: "X-Men", type: "action"}, {id: "4", name: "Ordinary People", type: "drama"}, {id: "5", name: "Billy Elliot", type: "drama"}, {id: "6", name: "Toy Story", type: "children"} ]; We are required to write ...
Read MoreJavaScript: Sort Object of Objects
Suppose we have an Object of Objects like this: const obj = { "CAB": { name: 'CBSSP', position: 2 }, "NSG": { name: 'NNSSP', position: 3 }, "EQU": { name: 'SSP', position: 1 } }; We need to write a JavaScript function that sorts the sub-objects based on the 'position' property in ascending order. Method 1: Using Object.keys() and ...
Read MoreGroup Similar Items in JSON in JavaScript
Suppose, we have a JSON Array that contains data about some tickets like this: const arr = [ { "quantity": "1", "description": "VIP Ticket to Event" }, { "quantity": "1", "description": "VIP Ticket to Event" }, { "quantity": ...
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