Extract mapping example to separate file

Author: tshemsedinov

JavaScript/5-instance.js

@@ -34,25 +34,3 @@ const person = (name, born) => () => `${name} was born in ${born} ${era(born)}`;
 
 const marcus2 = person('Marcus Aurelius', 121, 'Roma');
 console.log(marcus2());
-
-// Object reflection
-
-const omap = (obj, fn) => Object.keys(obj)
-  .reduce((res, key) => {
-    const [prop, val] = fn(key, obj[key]);
-    res[prop] = val;
-    return res;
-  }, {});
-
-const marcus3 = {
-  firstName: 'Marcus',
-  middleName: 'Aurelius',
-  lastName: 'Antoninus',
-};
-
-const marcus4 = omap(marcus3, (key, val) => {
-  const prop = key.toLowerCase().replace('name', '');
-  const value = val.toUpperCase();
-  return [prop, value];
-});
-console.log(marcus4);

JavaScript/6-mapping.js

@@ -0,0 +1,42 @@
+'use strict';
+
+// Map object instead of key iteration
+
+// Imperative
+
+const marcus1 = {
+  firstName: 'Marcus',
+  middleName: 'Aurelius',
+  lastName: 'Antoninus',
+};
+
+const marcus2 = {};
+
+for (const key in marcus1) {
+  const prop = key.toLowerCase().replace('name', '');
+  const value = marcus1[key].toUpperCase();
+  marcus2[prop] = value;
+}
+console.log(marcus2);
+
+// Functional
+
+const omap = (obj, fn) => Object.keys(obj)
+  .reduce((res, key) => {
+    const [prop, val] = fn(key, obj[key]);
+    res[prop] = val;
+    return res;
+  }, {});
+
+const marcus3 = {
+  firstName: 'Marcus',
+  middleName: 'Aurelius',
+  lastName: 'Antoninus',
+};
+
+const marcus4 = omap(marcus3, (key, val) => {
+  const prop = key.toLowerCase().replace('name', '');
+  const value = val.toUpperCase();
+  return [prop, value];
+});
+console.log(marcus4);