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-rw-r--r--js/src/builtin/WeakMap.js49
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diff --git a/js/src/builtin/WeakMap.js b/js/src/builtin/WeakMap.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// ES2017 draft rev 0e10c9f29fca1385980c08a7d5e7bb3eb775e2e4
+// 23.3.1.1 WeakMap, steps 6-8
+function WeakMapConstructorInit(iterable) {
+ var map = this;
+
+ // Step 6.a.
+ var adder = map.set;
+
+ // Step 6.b.
+ if (!IsCallable(adder))
+ ThrowTypeError(JSMSG_NOT_FUNCTION, typeof adder);
+
+ // Step 6.c.
+ var iterFn = iterable[std_iterator];
+ if (!IsCallable(iterFn))
+ ThrowTypeError(JSMSG_NOT_ITERABLE, DecompileArg(0, iterable));
+
+ var iter = callContentFunction(iterFn, iterable);
+ if (!IsObject(iter))
+ ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, typeof iter);
+
+ // Step 7 (not applicable).
+
+ // Step 8.
+ while (true) {
+ // Step 8.a.
+ var next = callContentFunction(iter.next, iter);
+ if (!IsObject(next))
+ ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, typeof next);
+
+ // Step 8.b.
+ if (next.done)
+ return;
+
+ // Step 8.c.
+ var nextItem = next.value;
+
+ // Step 8.d.
+ if (!IsObject(nextItem))
+ ThrowTypeError(JSMSG_INVALID_MAP_ITERABLE, "WeakMap");
+
+ // Steps 8.e-j.
+ callContentFunction(adder, map, nextItem[0], nextItem[1]);
+ }
+}