Add "Operators - Creation - defer" example.

02 - Operators - TODO/Creation - TODO/defer.js

@@ -0,0 +1,38 @@
+/*! European Union Public License version 1.2 !*/
+/*! Copyright © 2020 Rick Beerendonk          !*/
+
+const { defer, from } = require('../../node_modules/rxjs');
+
+const obs1 = from([1, 3, 5]);
+const obs2 = from([10, 20, 30]);
+
+let condition;
+
+const obs3 = defer(() => (condition ? obs1 : obs2));
+
+// obs3: condition = false
+
+condition = false;
+
+obs3.subscribe({
+  next: val => console.log(val),
+  complete: () => console.log('Complete!')
+});
+
+// obs3: condition = true
+
+condition = true;
+
+obs3.subscribe({
+  next: val => console.log(val),
+  complete: () => console.log('Complete!')
+});
+
+// 10
+// 20
+// 30
+// Complete!
+// 1
+// 3
+// 5
+// Complete!