Add the functionality to the site

script.js

@@ -0,0 +1,65 @@
+const value_dict = {
+    0: "Bronze",
+    1: "Silver",
+    2: "Gold",
+    3: "Platinum"
+}
+
+
+
+const calculate_remainder = (amount, delta) => {
+    if (delta < 0) {
+        return amount % 10 ** Math.abs(delta)
+    } else {
+        return 0
+    }
+};
+
+
+const convert_to = (amount, delta) => {
+    return Math.floor(amount * 10 ** delta)
+};
+
+
+
+const convert = () => {
+    let from_currency = parseInt(document.getElementById("from-in").value);
+    let to_currency = parseInt(document.getElementById("to-in").value);
+    let value = parseInt(document.getElementById("amount").value)
+    let response_area = document.getElementById("response-area");
+
+    let delta = from_currency - to_currency
+
+
+    // Ensure that they have selected coins so we can convert
+    if (isNaN(from_currency) || isNaN(to_currency)) {
+        response_area.innerText = "ERROR: Both sides of the conversion must have a selected coin type."
+        return
+    }
+
+
+    // Ensure we aren't converting to the same type of coin
+    if (delta === 0) {
+        response_area.innerText = "ERROR: Cannot convert from one coin to the same coin"
+        return
+    }
+
+
+    const remainder = calculate_remainder(value, delta);
+    const amount = convert_to(value, delta);
+
+
+    let response = "";
+
+
+    response += `${value_dict[to_currency]}: ${amount}`
+
+
+    // Check if we can't go into a whole number of the new coins
+    if (remainder !== 0) {
+        response += `<br>${value_dict[from_currency]}: ${remainder}`
+    }
+
+
+    response_area.innerHTML = response
+};