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/** * Copyright (c) 2013-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @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;