27 lines
769 B
Plaintext
27 lines
769 B
Plaintext
|
/**
|
||
|
|
* 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 maxBy
|
||
|
|
* @flow
|
||
|
|
*/
|
||
|
|
|
||
|
|
var minBy = require('./minBy');
|
||
|
|
|
||
|
|
var compareNumber = (a, b) => a - b;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the maximum element as measured by a scoring function f. Returns the
|
||
|
|
* first such element if there are ties.
|
||
|
|
*/
|
||
|
|
function maxBy<A, B>(as: Iterable<A>, f: (a: A) => B, compare?: ?(u: B, v: B) => number): ?A {
|
||
|
|
compare = compare || (compareNumber: any);
|
||
|
|
|
||
|
|
return minBy(as, f, (u, v) => (compare: any)(v, u));
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = maxBy;
|