Learned about reduce

Author: aayushyadavz

05_Iterations/eight_reduce.js

@@ -0,0 +1,47 @@
+// Reduce
+
+const myNums = [1, 2, 3]
+
+const total = myNums.reduce( function (acc, currval) {
+    console.log(`acc: ${acc} and currVal: ${currval}`);
+    return acc + currval
+}, 0 /* acc start value */ )
+console.log(total);
+
+/* Output: 
+acc: 0 and currval: 1 (0 + 1)
+acc: 1 and currval: 2 (1 + 2)
+acc: 3 and currval: 3 (3 + 3)
+6 (total) 
+
+--------------------------------------------------------------------
+'Reduce' in Arrow function */
+
+const myTotal = myNums.reduce( (acc, curr) => acc + curr, 0 )
+
+console.log(myTotal); /* Output: 6 
+
+--------------------------------------------------------------------
+Real life example */
+
+const shopppingCart = [
+    {
+        itemName: "JS Course",
+        price: 2999
+    },
+    {
+        itemName: "Py Course",
+        price: 999
+    },
+    {
+        itemName: "Mobile dev Course",
+        price: 5999
+    },
+    {
+        itemName: "Data Science Course",
+        price: 12999
+    },
+]
+
+const priceToPay = shopppingCart.reduce( (acc, item) => acc + item.price, 0 )
+console.log(priceToPay); // Output: 22996