node_modules

1 files changed, 37 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/minBy.js.flow b/node_modules/fbjs/lib/minBy.js.flow
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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule minBy
+ * @flow
+ */
+
+var compareNumber = (a, b) => a - b;
+
+/**
+ * Returns the minimum element as measured by a scoring function f. Returns the
+ * first such element if there are ties.
+ */
+function minBy<A, B>(as: Iterable<A>, f: (a: A) => B, compare?: ?(u: B, v: B) => number): ?A {
+  compare = compare || (compareNumber: any);
+
+  var minA = undefined;
+  var minB = undefined;
+  var seenFirst = false;
+  for (var a of as) {
+    var b = f(a);
+    if (!seenFirst || compare(b, (minB: any)) < 0) {
+      minA = a;
+      minB = b;
+      seenFirst = true;
+    }
+  }
+
+  return minA;
+}
+
+module.exports = minBy;
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