Time to Lightning JavaScript

var typeMetric = "miles";
const inputPad = document.getElementById("inputTime");


function calculateDistance() {
	time = parseInt(document.getElementById('inputTime').value);

	switch(typeMetric) {

		case miles:
			document.getElementById('result').textContent = (((343 * time)/1609.34).toFixed(3) + " Miles away");
			break;
		case meters:
			document.getElementById('result').textContent = ((343 * time).toFixed(3) + " Meters away");
			break;
		case kilometers:
			document.getElementById('result').textContent = (((343 * time)/1000).toFixed(3) + " Kilometers away");
			break;
		default:
			document.getElementById('result').textContent = (((343 * time)/1609.34).toFixed(3) + " Miles away");
			break;
	}
}
function changeMetric(metric) {
	typeMetric = metric;
	calculateDistance();
}

inputPad.addEventListener("keyup", function(event) {
	if (event.key === "Enter") {
		calculateDistance();
	}
});