react-native
Version:
A framework for building native apps using React
35 lines (31 loc) • 954 B
JavaScript
/**
* Copyright 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 forEachAccumulated
* @flow
*/
;
/**
* @param {array} arr an "accumulation" of items which is either an Array or
* a single item. Useful when paired with the `accumulate` module. This is a
* simple utility that allows us to reason about a collection of items, but
* handling the case when there is exactly one item (and we do not need to
* allocate an array).
*/
function forEachAccumulated<T>(
arr: ?(T | Array<T>),
cb: ((elem: T) => void),
scope: ?any,
) {
if (Array.isArray(arr)) {
arr.forEach(cb, scope);
} else if (arr) {
cb.call(scope, arr);
}
}
module.exports = forEachAccumulated;