You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.0 KiB
69 lines
2.0 KiB
10 years ago
|
/**
|
||
|
|
* Copyright 2014-2015, 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 toArray
|
||
|
|
* @typechecks
|
||
|
|
*/
|
||
|
|
|
||
|
|
var invariant = require("./invariant");
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convert array-like objects to arrays.
|
||
|
|
*
|
||
|
|
* This API assumes the caller knows the contents of the data type. For less
|
||
|
|
* well defined inputs use createArrayFromMixed.
|
||
|
|
*
|
||
|
|
* @param {object|function|filelist} obj
|
||
|
|
* @return {array}
|
||
|
|
*/
|
||
|
|
function toArray(obj) {
|
||
|
|
var length = obj.length;
|
||
|
|
|
||
|
|
// Some browse builtin objects can report typeof 'function' (e.g. NodeList in
|
||
|
|
// old versions of Safari).
|
||
|
|
("production" !== process.env.NODE_ENV ? invariant(
|
||
|
|
!Array.isArray(obj) &&
|
||
|
|
(typeof obj === 'object' || typeof obj === 'function'),
|
||
|
|
'toArray: Array-like object expected'
|
||
|
|
) : invariant(!Array.isArray(obj) &&
|
||
|
|
(typeof obj === 'object' || typeof obj === 'function')));
|
||
|
|
|
||
|
|
("production" !== process.env.NODE_ENV ? invariant(
|
||
|
|
typeof length === 'number',
|
||
|
|
'toArray: Object needs a length property'
|
||
|
|
) : invariant(typeof length === 'number'));
|
||
|
|
|
||
|
|
("production" !== process.env.NODE_ENV ? invariant(
|
||
|
|
length === 0 ||
|
||
|
|
(length - 1) in obj,
|
||
|
|
'toArray: Object should have keys for indices'
|
||
|
|
) : invariant(length === 0 ||
|
||
|
|
(length - 1) in obj));
|
||
|
|
|
||
|
|
// Old IE doesn't give collections access to hasOwnProperty. Assume inputs
|
||
|
|
// without method will throw during the slice call and skip straight to the
|
||
|
|
// fallback.
|
||
|
|
if (obj.hasOwnProperty) {
|
||
|
|
try {
|
||
|
|
return Array.prototype.slice.call(obj);
|
||
|
|
} catch (e) {
|
||
|
|
// IE < 9 does not support Array#slice on collections objects
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Fall back to copying key by key. This assumes all keys have a value,
|
||
|
|
// so will not preserve sparsely populated inputs.
|
||
|
|
var ret = Array(length);
|
||
|
|
for (var ii = 0; ii < length; ii++) {
|
||
|
|
ret[ii] = obj[ii];
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = toArray;
|