challenge4-solution.md

Challenge

What does result evaluate to? You might want to review the previous lesson for this one.

const myObj = {
  prop1: 'first value',
  prop2: 20
};

// Index         0   1   2
const myArray = [40, 50, 2];

const result = myObj.prop2 === (myArray[0] / myArray[2]);

Solution

This is also a review of the previous lesson combined with the current lesson.

Remember, to access the value of an object property, we use "dot notation". If we wanted to retrieve the value of 20, we need to use myObj.prop2.

Also remember that in order to access values from an array, we have to use "bracket notation" and consider what "index" we want to retrieve. Arrays are "zero-indexed", which means the first value has an index of 0 and that increases by 1. If we wanted to retrieve the value of 50 from this array, we would use myArray[1].

Once we remember those facts, the final result expression isn't so bad.

Just list out each part of the expression and what they equal:

• myObj.prop2 equals 20
• myArray[0] equals 40
• myArray[2] equals 2

So now, we can look at our expression like this:

const result = 20 === (40 / 2); // true

40 / 2 evaluates to 20, and 20 === 20 evaluates to true.