Example: async.js/map usage

Author: tshemsedinov

JavaScript/d-asyncjs-map.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const async = require('async');
+
+const arr = [1, 2, 3, 4];
+const obj = { a: 1, b: 2, c: 3, d: 4 };
+
+console.log('Map array');
+
+async.map(
+  arr,
+  (item, callback) => {
+    console.dir({ item });
+    callback(null, item * 2);
+  },
+  (err, res) => {
+    console.dir({ err, res });
+  }
+);
+
+console.log('Map object');
+
+async.map(
+  obj,
+  (item, callback) => {
+    console.dir({ item });
+    if (item === 2) callback(new Error('Oh, shit'), 'value');
+    else callback(null, item * 2);
+  },
+  (err, res) => {
+    console.dir({ error: err.message, res });
+  }
+);