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Articles on Trending Technologies
Technical articles with clear explanations and examples
Extract unique objects by attribute from an array of objects in JavaScript
We will learn to extract unique objects by attribute from an array of objects in this tutorial. Sometimes, we need to filter objects from the array of objects based on a particular attribute. For example, we have an id as a key to identify the object. So, we need to ensure that the array contains only a single object with a single id. If two or more objects contain the same primary key value, it can cause the problem of uniquely identifying objects. Here, we will learn different approaches to filter all unique objects from the array based ...
Read MoreHow to store all dates in an array present in between given two dates in JavaScript?
Sometimes, we require to get all the dates between the given date range. In this tutorial, we will take two dates and find all dates between two dates. Also, we will store all dates in the array. Here, we will learn three approaches to storing all dates in an array present between given two dates in JavaScript. Using the while loop and setDate() method We can use the while loop for iteration and the setDate() method to set dates in the date object. On every iteration of the while loop, we can increase the date by one ...
Read MoreHow to convert array of decimal strings to array of integer strings without decimal in JavaScript
We are required to write a JavaScript function that takes in an array of decimal strings. The function should return an array of strings of integers obtained by flooring the original corresponding decimal values of the array. For example, If the input array is − const input = ["1.00", "-2.5", "5.33333", "8.984563"]; Then the output should be − const output = ["1", "-2", "5", "8"]; Method 1: Using parseInt() The parseInt() function parses a string and returns an integer. It automatically truncates decimal parts. const input = ["1.00", ...
Read MoreFunction to compute factorial of a number in JavaScript
In this article, we will explore different methods to calculate the factorial of a number in JavaScript. What is Factorial? The factorial of a non-negative integer n is the product of all positive integers less than or equal to n. For example, the factorial of 4 is 4 × 3 × 2 × 1 = 24, represented as 4!. The value of 0! is defined as 1 by convention. Mathematical Formula The factorial of n is represented as n! and calculated using: n! = n × (n-1) × (n-2) × ... × 3 ...
Read MoreCompare keys & values in a JSON object when one object has extra keys in JavaScript
When comparing JSON objects in JavaScript, you often need to check if the common keys have matching values, even when one object has extra properties. This is useful for validating partial object matches or checking if one object is a subset of another. Problem Statement Consider these two objects: const obj1 = {a: "apple", b: "banana", c: "carrot"}; const obj2 = {a: "apple", e: "egg", b: "banana", c: "carrot", d: "dog"}; We need a function that returns true because all common keys (a, b, c) have matching values, ignoring the extra keys (e, d) ...
Read MoreEfficient algorithm for grouping elements and counting duplicates in JavaScript
When working with arrays of objects in JavaScript, you often need to group elements based on shared properties and count duplicates. This is common in data processing tasks like analyzing user activity, inventory management, or survey results. Problem Overview Given an array of objects, we want to group them by a specific property and count how many times each group appears. For example, if we have objects with properties like coordinates or identifiers, we can group by the first property and display counts. Original data: X A B O Y X Z I Y ...
Read MoreHow to crop the left offset in a cloned image using FabricJS?
In this tutorial, we are going to show how you can crop the left offset in a cloned image using FabricJS. We can create an Image object by creating an instance of fabric.Image. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to crop the left offset in a cloned image, we use the left property. Syntax cloneAsImage( callback: function, { left: Number}: Object): fabric.Object Parameters callback (optional) − This parameter is a function ...
Read MoreHow to switch off object caching for a Polygon object using FabricJS?
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity, etc. A FabricJS object is cached on an additional canvas for saving time during re-using the object. In order to switch off object caching for Polygon object we use the objectCaching property. Syntax new fabric.Polygon( points: Array, { objectCaching: Boolean }: Object ) ...
Read MoreHow to convert array into array of objects using map() and reduce() in JavaScript
Converting arrays into arrays of objects is a common task in JavaScript. This article shows how to use map() and reduce() together to transform nested arrays into structured objects. Problem Statement Suppose we have an array of arrays like this: const arr = [ [ ['juice', 'apple'], ['maker', 'motts'], ['price', 12] ], [ ['juice', 'orange'], ['maker', 'sunkist'], ['price', 11] ] ]; We need to convert this nested array structure into ...
Read MoreReturn an array of all the indices of minimum elements in the array in JavaScript
In JavaScript arrays, you might need to find all indices where the minimum value appears. This is useful when the smallest element occurs multiple times and you want to locate all positions. Problem Statement Given an array with duplicate minimum values, we need to return an array containing all indices of these minimum elements. Input: [10, 22, 30, 44, 10, 22, 30, 10, 10] Output: [0, 4, 7, 8] Here, 10 is the minimum value appearing at indices 0, 4, 7, and 8. Using Math.min() with Spread Operator Math.min() returns the smallest ...
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