refactor: export SimpleMap

Author: gajus

src/SimpleMap.js

@@ -0,0 +1,21 @@
+export default class {
+  constructor () {
+    this.size = 0;
+    this.keys = [];
+    this.values = [];
+  }
+
+  get (key) {
+    const index = this.keys.indexOf(key);
+
+    return this.values[index];
+  }
+
+  set (key, value) {
+    this.keys.push(key);
+    this.values.push(value);
+    this.size = this.keys.length;
+
+    return value;
+  }
+}

tests/SimpleMap.js

@@ -0,0 +1,38 @@
+import {
+  expect
+} from 'chai';
+import SimpleMap from './../src/SimpleMap';
+
+describe('SimpleMap', () => {
+  context('simple map with primitive or object as keys', () => {
+    const values = [
+      [1, 'something'],
+      ['1', 'somethingElse'],
+      [{}, []],
+      [null, null]
+    ];
+
+    let map;
+
+    beforeEach(() => {
+      map = new SimpleMap();
+    });
+
+    it('should set', () => {
+      values.forEach(([key, value]) => {
+        map.set(key, value);
+      });
+      expect(map.size).to.equal(values.length);
+    });
+
+    it('should get', () => {
+      values.forEach(([key, value]) => {
+        map.set(key, value);
+      });
+
+      values.forEach(([key, value]) => {
+        expect(map.get(key)).to.equal(value);
+      });
+    });
+  });
+});