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Demo2/2.1-2.3/Components/Course.js

+import React from 'react'
+
+const Course = ( {course} ) => {
+
+    var total = course.parts.reduce(function(summa, harkat) {
+        return summa + harkat.exercises
+    }, 0 )
+
+    return (
+        <div>
+            <h1>{course.name}</h1>
+            {course.parts.map(x => <p>{x.name} {x.exercises}</p>)}
+            <p>{total}</p>
+        </div>
+    )
+}
+export default Course
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