projEuler4.ts

inputs/passing/projEuler4.ts

@@ -0,0 +1,33 @@
+export default function main() {
+  let largest = 0;
+
+  for (let i = 999; i >= 100; i--) {
+    for (let j = i; j >= 100; j--) {
+      const product = i * j;
+
+      if (product <= largest) {
+        break;
+      }
+
+      if (isPalindrome(product)) {
+        largest = product;
+      }
+    }
+  }
+
+  return largest;
+}
+
+function isPalindrome(n: number) {
+  let nStr = `${n}`;
+  let lenM1 = nStr.length - 1;
+  let halfLen = nStr.length / 2;
+
+  for (let i = 0; i < halfLen; i++) {
+    if (nStr[i] !== nStr[lenM1 - i]) {
+      return false;
+    }
+  }
+
+  return true;
+}

src/vstc/virtual_machine/operations.rs

@@ -245,7 +245,12 @@ pub fn op_sub(left: Val, right: Val) -> Val {
     Val::Number(_) => Val::Undefined, // TODO: toString etc
     Val::String(string_data) => {
       let right_index = match right.to_index() {
-        None => { return Val::Undefined }
+        None => {
+          return match right.val_to_string().as_str() == "length" {
+            true => Val::Number(string_data.len() as f64),
+            false => Val::Undefined,
+          }
+        },
         Some(i) => i,
       };