react app

react-app/node_modules/react/lib/toArray.js

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+/**
+ * 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;