--- /dev/null
+var anObject = require('../internals/an-object');
+var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
+var toLength = require('../internals/to-length');
+var bind = require('../internals/function-bind-context');
+var getIteratorMethod = require('../internals/get-iterator-method');
+var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
+
+var Result = function (stopped, result) {
+ this.stopped = stopped;
+ this.result = result;
+};
+
+var iterate = module.exports = function (iterable, fn, that, AS_ENTRIES, IS_ITERATOR) {
+ var boundFunction = bind(fn, that, AS_ENTRIES ? 2 : 1);
+ var iterator, iterFn, index, length, result, next, step;
+
+ if (IS_ITERATOR) {
+ iterator = iterable;
+ } else {
+ iterFn = getIteratorMethod(iterable);
+ if (typeof iterFn != 'function') throw TypeError('Target is not iterable');
+ // optimisation for array iterators
+ if (isArrayIteratorMethod(iterFn)) {
+ for (index = 0, length = toLength(iterable.length); length > index; index++) {
+ result = AS_ENTRIES
+ ? boundFunction(anObject(step = iterable[index])[0], step[1])
+ : boundFunction(iterable[index]);
+ if (result && result instanceof Result) return result;
+ } return new Result(false);
+ }
+ iterator = iterFn.call(iterable);
+ }
+
+ next = iterator.next;
+ while (!(step = next.call(iterator)).done) {
+ result = callWithSafeIterationClosing(iterator, boundFunction, step.value, AS_ENTRIES);
+ if (typeof result == 'object' && result && result instanceof Result) return result;
+ } return new Result(false);
+};
+
+iterate.stop = function (result) {
+ return new Result(true, result);
+};