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Articles by AmitDiwan
Page 290 of 840
Encoding a number string into a string of 0s and 1s in JavaScript
We need to write a JavaScript function that encodes a decimal number string into binary based on specific rules. For each digit, we determine the number of bits required, prepend (k-1) zeros followed by 1, then append the digit's binary representation. Encoding Rules For each digit d in the number string: Let k be the number of bits needed to represent d in binary Write (k-1) zeros followed by the digit 1 Write digit d as a binary string Concatenate ...
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 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 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 MoreRemove duplicates from array with URL values in JavaScript
Suppose, we have an array of objects like this − const arr = [ { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello-how-are-you', id: ...
Read MoreMost efficient method to groupby on an array of objects - JavaScript
Grouping arrays of objects is a common task in JavaScript data processing. We'll explore efficient methods to group objects by single or multiple properties and aggregate values. Sample Data Let's start with an array of objects representing project phases, steps, and tasks: const arr = [ { Phase: "Phase 1", Step: "Step 1", Task: "Task 1", Value: "5" }, { Phase: "Phase 1", Step: "Step 1", Task: "Task 2", Value: "10" }, { Phase: "Phase 1", Step: "Step 2", Task: "Task 1", Value: "15" ...
Read MoreFinding the product of array elements with reduce() in JavaScript
We are required to write a JavaScript function that takes in an array and finds the product of all its elements using the reduce() method. Understanding reduce() for Products The reduce() method executes a reducer function on each array element, accumulating results into a single value. For multiplication, we start with an initial value of 1 and multiply each element. Syntax array.reduce((accumulator, currentValue) => { return accumulator * currentValue; }, 1); Example: Basic Product Calculation const arr = [3, 1, 4, 1, 2, -2, -1]; const ...
Read MoreGenerating 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 MoreGet the smallest array from an array of arrays in JavaScript
When working with nested arrays in JavaScript, you might need to find the smallest subarray based on the number of elements. This is useful for data processing, filtering operations, or when you need to identify the shortest path or sequence. Suppose we have a nested array of arrays like this: const arr = [ ["LEFT", "RIGHT", "RIGHT", "BOTTOM", "TOP"], ["RIGHT", "LEFT", "TOP"], ["TOP", "LEFT"] ]; console.log("Original array:", arr); Original array: [ [ 'LEFT', 'RIGHT', 'RIGHT', 'BOTTOM', 'TOP' ], ...
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