adding util to extrct props from uri

src/spotify/index.js

@@ -1,5 +1,14 @@
 const API_BASE = 'https://api.spotify.com/';
 
 module.exports = {
-    API_BASE
+    API_BASE,
+
+    extractFromUri(uri, property) {
+        const arr = uri.split(':');
+        const propIndex = arr.indexOf(property);
+        if (propIndex === -1) {
+            return undefined;
+        }
+        return arr[propIndex + 1];
+    }
 };

test/spotify/test_extractFromUri.js

@@ -0,0 +1,41 @@
+const {describe, it} = require('mocha');
+const { expect, config } = require('chai');
+const { extractFromUri } = require('../../src/spotify');
+
+const context = describe;
+
+
+describe('The extractFromUri util', () => {
+    context('With a link to a playlist', () => {
+
+        const uri = 'spotify:user:awpoops:playlist:5PP1I2m0uxEBb3VKLhI7bP';
+
+        it('can extract the playlist id', () => {
+            const playlistId = extractFromUri(uri, 'playlist');
+            expect(playlistId).to.eq('5PP1I2m0uxEBb3VKLhI7bP');
+        });
+
+        it('can extract the user id', () => {
+            const userId = extractFromUri(uri, 'user');
+            expect(userId).to.eq('awpoops');
+        });
+    });
+
+    context('with an invalid string', () => {
+        const uri = 'foo:bar:baz';
+
+        it('returns an undefined for playlist', () => {
+            const playlistId = extractFromUri(uri, 'playlist');
+            expect(playlistId).to.eq(undefined);
+        });
+    });
+
+    context('with an empty string', () => {
+        const uri = '';
+
+        it('returns an undefined for playlist', () => {
+            const playlistId = extractFromUri(uri, 'playlist');
+            expect(playlistId).to.eq(undefined);
+        });
+    });
+});

test/util/test_parse.js

@@ -1,7 +1,7 @@
 const { describe, it } = require('mocha');
 const { expect, config } = require('chai');
 
-const{ parseFormString } = require('../../src/util/parse');
+const { parseFormString } = require('../../src/util/parse');
 
 const context = describe;