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Optimized Atomcms daily updated/node_modules/aigle/lib/flow.js

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+'use strict';
+
+const Aigle = require('./aigle');
+
+module.exports = flow;
+
+/**
+ * @param {Function[]} funcs
+ * @return {Function} Returns the new composite function
+ * @example
+ *   const add = (a, b) => Aigle.delay(10, a + b);
+ *   const square = n => Aigle.delay(10, n * n);
+ *   const addSquare = Aigle.flow(add, square);
+ *   return addSquare(1, 2).then(value => {
+ *     console.log(value); // 9
+ *   });
+ */
+function flow(...funcs) {
+  const [handler = thru, ...handlers] = flatArray(funcs);
+  return (...args) =>
+    Aigle.resolve(handler(...args)).then(data =>
+      Aigle.reduce(handlers, (acc, func) => func(acc), data)
+    );
+}
+
+function thru(arg) {
+  return arg;
+}
+
+function flatArray(args) {
+  const l = args.length;
+  const array = [];
+  let i = -1;
+  while (++i < l) {
+    const arg = args[i];
+    Array.isArray(arg) ? array.push(...arg) : array.push(arg);
+  }
+  return array;
+}