Daily JavaScript Challenge #JS-247: Find the largest integer per row in a matrix
Welcome developers, today we present a challenge to keep programming skills sharp and practice array manipulation in JavaScript.
Difficulty: Medium. Topic: Arrays and matrix processing.
Challenge description: Given a two-dimensional array of integers, write a function that returns an array with the largest integer from each row of the matrix. For example, for the input [[1,2,3],[3,2,1],[5,5,4]] the expected output is [3,3,5].
Suggested approach: iterate through each row and calculate the maximum of its elements. In JavaScript you can take advantage of Math.max along with the spread operator or use a reduce loop for more control. Expected time complexity O(n m) where n is the number of rows and m the number of columns.
Example strategy in words: for each row initialize a max value with the first element and update max by comparing with each element of the row, at the end add max to the result. Alternatively transform each row with Math.max applying spread and collect the results.
Edge cases to consider: empty rows, empty matrix, negative numbers, and rows with repeated values. Decide how to handle empty rows according to the requirement: omit them, return null for that position, or throw an error.
Step by step to test the challenge: 1) Fork the exercise if you work on a collaborative platform 2) Implement the function 3) Run tests including normal cases and edge cases 4) Share your approach and learnings in the comments.
Useful resources: check the Math.max reference on MDN https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max to understand its behavior and combination with the spread operator.
Questions for the community: How did you approach the problem? Did you find curious cases? What optimizations or variations do you propose if the matrix is very large or if working with data streams?
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This challenge is part of our Daily JavaScript Challenge series. Practice every day, share solutions, and let's grow together as a developer community.
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