Explore the basics of JavaScript in greater detail to solve real-world problems.

Zero to Hero in JavaScript

This module aims to teach us how to write cleaner, more modular, and more scalable code in JavaScript by giving us an understanding of object-oriented programming (OOP). We'll start with the basics of object-oriented programming and build up to more advanced concepts such as data protection and inheritance. Along the way, we'll learn how each concept applies to JavaScript in particular, as well as how various JavaScript features make it a suitable language for object-oriented programming.

JavaScript: A Deep Dive

# Solution

After setting up loops to iterate the entire two-dimensional array, the solution relies on visualizing the array and ensuring that *correct indices* are *accessed*. First create **nested loops** to *iterate* the given two-dimensional array. Set *terminating* conditions to the size of the arrays so that no invalid index is accessed. After setting it up, *access* each object. Since the problem requires us to take the sum of *population* with *temperature* less than or equal to 10°C, we only need to look at the `temp` and `population` properties of the object. For each element we do the following:

- **If** the element value is *equal* to `null`, *ignore* it.
- **If** the object's `temp` property is assigned a value *greater* than `10`, *ignore* it.
- **Otherwise**, for an object with `temp` property assigned to a value *less than or equal* to `10`, *add* the `population` property value to the `ans` variable.

Once we set up our conditionals for each element, our program will work as required.

Solution overview of the “Counting Population” exercise.


Solution Review: Counting Population

Solution