feat(async): clulib.async.forEach + clulib.async.forEachRight

b-strauss · Feb 12, 2017 · a9fc7df · a9fc7df
1 parent a60dbd1
commit a9fc7df
Showing 1 changed file with 23 additions and 0 deletions.
diff --git a/lib/async/async.js b/lib/async/async.js
@@ -0,0 +1,23 @@
+goog.provide('clulib.async');
+
+/**
+ * @param {Array<T>} array
+ * @param {function(T, number, Array<T>): Promise} action
+ * @returns {Promise}
+ * @template T
+ */
+clulib.async.forEach = function (array, action) {
+  return array.reduce((promise, element, index, arr) => {
+    return promise.then(() => action(element, index, arr));
+  }, Promise.resolve());
+};
+
+/**
+ * @param {Array<T>} array
+ * @param {function(T, number, Array<T>): Promise} action
+ * @returns {Promise}
+ * @template T
+ */
+clulib.async.forEachRight = function (array, action) {
+  return clulib.async.forEach(array.reverse(), action);
+};