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+# @babel/plugin-transform-for-of
+
+> Compile ES2015 for...of to ES5
+
+## Example
+
+**In**
+
+```js
+for (var i of foo) {}
+```
+
+**Out**
+
+```js
+var _iteratorNormalCompletion = true;
+var _didIteratorError = false;
+var _iteratorError = undefined;
+
+try {
+  for (var _iterator = foo[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+    var i = _step.value;
+  }
+} catch (err) {
+  _didIteratorError = true;
+  _iteratorError = err;
+} finally {
+  try {
+    if (!_iteratorNormalCompletion && _iterator.return != null) {
+      _iterator.return();
+    }
+  } finally {
+    if (_didIteratorError) {
+      throw _iteratorError;
+    }
+  }
+}
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-transform-for-of
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+Without options:
+
+```js
+{
+  "plugins": ["@babel/plugin-transform-for-of"]
+}
+```
+
+With options:
+
+```js
+{
+  "plugins": [
+    ["@babel/plugin-transform-for-of", {
+      "loose": true, // defaults to false
+      "assumeArray": true // defaults to false
+    }]
+  ]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-transform-for-of script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/plugin-transform-for-of"]
+});
+```
+
+## Options
+
+### `loose`
+
+`boolean`, defaults to `false`
+
+In loose mode, arrays are put in a fast path, thus heavily increasing performance.
+All other iterables will continue to work fine.
+
+#### Example
+
+**In**
+
+```js
+for (var i of foo) {}
+```
+
+**Out**
+
+```js
+for (var _iterator = foo, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+  var _ref;
+
+  if (_isArray) {
+    if (_i >= _iterator.length) break;
+    _ref = _iterator[_i++];
+  } else {
+    _i = _iterator.next();
+    if (_i.done) break;
+    _ref = _i.value;
+  }
+
+  var i = _ref;
+}
+```
+
+#### Abrupt completions
+
+In loose mode an iterator's `return` method will not be called on abrupt completions caused by thrown errors.
+
+Please see [google/traceur-compiler#1773](https://github.com/google/traceur-compiler/issues/1773) and
+[babel/babel#838](https://github.com/babel/babel/issues/838) for more information.
+
+### `assumeArray`
+`boolean`, defaults to `false`
+
+This will apply the optimization shown below to all for-of loops by assuming that _all_ loops are arrays.
+
+Can be useful when you just want a for-of loop to represent a basic for loop over an array.
+
+### Optimization
+
+If a basic array is used, Babel will compile the for-of loop down to a regular for loop.
+
+**In**
+
+```js
+for (let a of [1,2,3]) {}
+```
+
+**Out**
+
+```js
+var _arr = [1, 2, 3];
+for (var _i = 0; _i < _arr.length; _i++) {
+  var a = _arr[_i];
+}
+```