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'use strict';
/**
* 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.
*
* @typechecks
*/
var push = Array.prototype.push;
/**
* Applies a function to every item in an array and concatenates the resulting
* arrays into a single flat array.
*
* @param {array} array
* @param {function} fn
* @return {array}
*/
function flatMapArray(array, fn) {
var ret = [];
for (var ii = 0; ii < array.length; ii++) {
var result = fn.call(array, array[ii], ii);
if (Array.isArray(result)) {
push.apply(ret, result);
} else if (result != null) {
throw new TypeError('flatMapArray: Callback must return an array or null, ' + 'received "' + result + '" instead');
}
}
return ret;
}
module.exports = flatMapArray;
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