Bump to v3.0.0.

function/flow.js

@@ -0,0 +1,52 @@
+import arrayEvery from '../internal/arrayEvery';
+import isFunction from '../lang/isFunction';
+
+/** Used as the `TypeError` message for "Functions" methods. */
+var FUNC_ERROR_TEXT = 'Expected a function';
+
+/**
+ * Creates a function that returns the result of invoking the provided
+ * functions with the `this` binding of the created function, where each
+ * successive invocation is supplied the return value of the previous.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {...Function} [funcs] Functions to invoke.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function add(x, y) {
+ *   return x + y;
+ * }
+ *
+ * function square(n) {
+ *   return n * n;
+ * }
+ *
+ * var addSquare = _.flow(add, square);
+ * addSquare(1, 2);
+ * // => 9
+ */
+function flow() {
+  var funcs = arguments,
+      length = funcs.length;
+
+  if (!length) {
+    return function() {};
+  }
+  if (!arrayEvery(funcs, isFunction)) {
+    throw new TypeError(FUNC_ERROR_TEXT);
+  }
+  return function() {
+    var index = 0,
+        result = funcs[index].apply(this, arguments);
+
+    while (++index < length) {
+      result = funcs[index].call(this, result);
+    }
+    return result;
+  };
+}
+
+export default flow;