Learning JavaScript Data Structures and Algorithms - Third Edition

Two-dimensional and multi-dimensional arrays

At the beginning of this chapter, we used a temperature measurement example. We will now use this example one more time. Let's consider that we need to measure the temperature hourly for a few days. Now that we already know we can use an array to store the temperatures, we can easily write the following code to store the temperatures over 2 days:

let averageTempDay1 = [72, 75, 79, 79, 81, 81];  
let averageTempDay2 = [81, 79, 75, 75, 73, 72]; 

However, this is not the best approach; we can do better! We can use a matrix (a two-dimensional array or an array of arrays) to store this information, in which each row will represent the day, and each column will represent an hourly measurement of temperature, ...