variable lookup

last-endcode · last-endcode · commit 814fec6f5911 · 2020-10-14T11:51:43.000+07:00
diff --git a/32_variable_lookup.js b/32_variable_lookup.js
@@ -0,0 +1,25 @@
+// Lookup variable
+// js always lookup variable
+
+const numGlobal = 100;
+
+function total(num1, num2) {
+  //120 cz use numGlobal 100, but if inside function
+  //has nameGlobal with 50 result be 70
+  const numGlobal = 50;
+  const result = num1 + num2 + numGlobal;
+  //inner function
+  function multiply() {
+    //if result * numGlobal use value in function total
+    // sum be 3500, same with total function
+    // if multiply has local nameGlobal 1000 sum be 70000
+    const numGlobal = 1000;
+    const sum = result * numGlobal;
+    console.log(sum); //70000
+  }
+  multiply();
+  return result;
+}
+
+const result = total(10, 10);
+console.log(result);
