Create 014.js

Author: Walker30263

014.js

@@ -0,0 +1,25 @@
+//accumulator
+let longestChainLength = {
+    number: 0,
+    length: 0
+};
+
+for (let i = 1; i <= 1000000; i++) {
+    let sequence = [i];
+
+    while (sequence[sequence.length - 1] !== 1) { //repeat the Collatz algorithm until we arrive at 1
+        let lastTerm = sequence[sequence.length - 1];
+        if (lastTerm % 2 === 0) { //if the last term is even...
+            sequence.push(lastTerm / 2);
+        } else { //if the last term is odd...
+            sequence.push((3 * lastTerm) + 1);
+        }
+    }
+
+    if (sequence.length > longestChainLength.length) {
+        longestChainLength.length = sequence.length;
+        longestChainLength.number = i;
+    }
+}
+
+console.log(longestChainLength.number); //our answer!