--- /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 iteratorClose = require('../internals/iterator-close');
+
+var Result = function (stopped, result) {
+ this.stopped = stopped;
+ this.result = result;
+};
+
+module.exports = function (iterable, unboundFunction, options) {
+ var that = options && options.that;
+ var AS_ENTRIES = !!(options && options.AS_ENTRIES);
+ var IS_ITERATOR = !!(options && options.IS_ITERATOR);
+ var INTERRUPTED = !!(options && options.INTERRUPTED);
+ var fn = bind(unboundFunction, that, 1 + AS_ENTRIES + INTERRUPTED);
+ var iterator, iterFn, index, length, result, next, step;
+
+ var stop = function (condition) {
+ if (iterator) iteratorClose(iterator);
+ return new Result(true, condition);
+ };
+
+ var callFn = function (value) {
+ if (AS_ENTRIES) {
+ anObject(value);
+ return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
+ } return INTERRUPTED ? fn(value, stop) : fn(value);
+ };
+
+ 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 = callFn(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) {
+ try {
+ result = callFn(step.value);
+ } catch (error) {
+ iteratorClose(iterator);
+ throw error;
+ }
+ if (typeof result == 'object' && result && result instanceof Result) return result;
+ } return new Result(false);
+};