Initial project import

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

@@ -0,0 +1,92 @@
+'use strict';
+var $ = require('../internals/export');
+var anObject = require('../internals/an-object');
+var anObjectOrUndefined = require('../internals/an-object-or-undefined');
+var call = require('../internals/function-call');
+var uncurryThis = require('../internals/function-uncurry-this');
+var getIteratorRecord = require('../internals/get-iterator-record');
+var getIteratorFlattenable = require('../internals/get-iterator-flattenable');
+var getModeOption = require('../internals/get-mode-option');
+var iteratorClose = require('../internals/iterator-close');
+var iteratorCloseAll = require('../internals/iterator-close-all');
+var iteratorZip = require('../internals/iterator-zip');
+var IS_PURE = require('../internals/is-pure');
+
+var concat = uncurryThis([].concat);
+var push = uncurryThis([].push);
+var THROW = 'throw';
+
+// `Iterator.zip` method
+// https://github.com/tc39/proposal-joint-iteration
+$({ target: 'Iterator', stat: true, forced: IS_PURE }, {
+  zip: function zip(iterables /* , options */) {
+    anObject(iterables);
+    var options = arguments.length > 1 ? anObjectOrUndefined(arguments[1]) : undefined;
+    var mode = getModeOption(options);
+    var paddingOption = mode === 'longest' ? anObjectOrUndefined(options && options.padding) : undefined;
+
+    var iters = [];
+    var padding = [];
+    var inputIter = getIteratorRecord(iterables);
+    var iter, done, next;
+    while (!done) {
+      try {
+        next = anObject(call(inputIter.next, inputIter.iterator));
+        done = next.done;
+      } catch (error) {
+        return iteratorCloseAll(iters, THROW, error);
+      }
+      if (!done) {
+        try {
+          iter = getIteratorFlattenable(next.value, false);
+        } catch (error) {
+          return iteratorCloseAll(concat([inputIter], iters), THROW, error);
+        }
+        push(iters, iter);
+      }
+    }
+
+    var iterCount = iters.length;
+    var i, paddingDone, paddingIter;
+    if (mode === 'longest') {
+      if (paddingOption === undefined) {
+        for (i = 0; i < iterCount; i++) push(padding, undefined);
+      } else {
+        try {
+          paddingIter = getIteratorRecord(paddingOption);
+        } catch (error) {
+          return iteratorCloseAll(iters, THROW, error);
+        }
+        var usingIterator = true;
+        for (i = 0; i < iterCount; i++) {
+          if (usingIterator) {
+            try {
+              next = anObject(call(paddingIter.next, paddingIter.iterator));
+              paddingDone = next.done;
+              next = next.value;
+            } catch (error) {
+              return iteratorCloseAll(iters, THROW, error);
+            }
+            if (paddingDone) {
+              usingIterator = false;
+            } else {
+              push(padding, next);
+            }
+          } else {
+            push(padding, undefined);
+          }
+        }
+
+        if (usingIterator) {
+          try {
+            iteratorClose(paddingIter.iterator, 'normal');
+          } catch (error) {
+            return iteratorCloseAll(iters, THROW, error);
+          }
+        }
+      }
+    }
+
+    return iteratorZip(iters, mode, padding);
+  }
+});