fixes

exercise_1.js

@@ -1,9 +1,12 @@
 {
+	'use strict'
+
 	let shuttleName = `Determination`;
-	let shuttleSpeed = 17500;
-	let marsDistance = 225000000;
-	let moonDistance = 384400;
+	let shuttleSpeed = 17_500;
+	let marsDistance = 225_000_000; //veranderd niet veel, maak maar eens een const van. MARS_DISTANCE
+	let moonDistance = 384_400;
 	let milesPerKilometre = 0.621;
+	const HOURS_PER_DAY = 24
 
 	console.log(typeof (shuttleName));
 	console.log(typeof (marsDistance));
@@ -13,11 +16,11 @@
 
 	let milesToMars = marsDistance * milesPerKilometre;
 	let hoursToMars = milesToMars / shuttleSpeed;
-	let daysToMars = hoursToMars / 24;
+	let daysToMars = hoursToMars / HOURS_PER_DAY;
 
 	let milesToMoon = moonDistance * milesPerKilometre;
 	let hoursToMoon = milesToMoon / shuttleSpeed;
-	let daysToMoon = hoursToMoon / 24;
+	let daysToMoon = hoursToMoon / HOURS_PER_DAY;
 
 	console.log(`${shuttleName} will take ${daysToMars.toFixed(2)} days to reach Mars.`);
 	console.log(`${shuttleName} will take ${daysToMoon.toFixed(2)} days to reach the Moon.`);