feat:node-modules

node_modules/core-js/modules/esnext.iterator.concat.js

@@ -0,0 +1,56 @@
+'use strict';
+var $ = require('../internals/export');
+var call = require('../internals/function-call');
+var aCallable = require('../internals/a-callable');
+var anObject = require('../internals/an-object');
+var getIteratorMethod = require('../internals/get-iterator-method');
+var createIteratorProxy = require('../internals/iterator-create-proxy');
+
+var $Array = Array;
+
+var IteratorProxy = createIteratorProxy(function () {
+  while (true) {
+    var iterator = this.iterator;
+    if (!iterator) {
+      var iterableIndex = this.nextIterableIndex++;
+      var iterables = this.iterables;
+      if (iterableIndex >= iterables.length) {
+        this.done = true;
+        return;
+      }
+      var entry = iterables[iterableIndex];
+      this.iterables[iterableIndex] = null;
+      iterator = this.iterator = call(entry.method, entry.iterable);
+      this.next = iterator.next;
+    }
+    var result = anObject(call(this.next, iterator));
+    if (result.done) {
+      this.iterator = null;
+      this.next = null;
+      continue;
+    }
+    return result.value;
+  }
+});
+
+// `Iterator.concat` method
+// https://github.com/tc39/proposal-iterator-sequencing
+$({ target: 'Iterator', stat: true, forced: true }, {
+  concat: function concat() {
+    var length = arguments.length;
+    var iterables = $Array(length);
+    for (var index = 0; index < length; index++) {
+      var item = anObject(arguments[index]);
+      iterables[index] = {
+        iterable: item,
+        method: aCallable(getIteratorMethod(item))
+      };
+    }
+    return new IteratorProxy({
+      iterables: iterables,
+      nextIterableIndex: 0,
+      iterator: null,
+      next: null
+    });
+  }
+});