Objects as Maps

Author: Benjamin De Cock

README.md

@@ -781,6 +781,32 @@ for (var prop in obj) {
 Object.keys(obj).forEach(prop => console.log(prop));
 ```
 
+### Objects as Maps
+
+While objects have legitimate use cases, maps are usually a better, more powerful choice. When in
+doubt, use a `Map`.
+
+```javascript
+// bad
+const me = {
+  name: "Ben",
+  age: 30
+};
+var meSize = Object.keys(me).length;
+meSize; // => 2
+me.country = "Belgium";
+meSize++;
+meSize; // => 3
+
+// good
+const me = Map();
+me.set("name", "Ben");
+me.set("age", 30);
+me.size; // => 2
+me.set("country", "Belgium");
+me.size; // => 3
+```
+
 ### Curry
 
 Currying might have its place in other languages, but avoid it in JavaScript. It makes your code harder to read by introducing a foreign paradigm while the appropriate use cases are extremely unusual.