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-rw-r--r--js/src/builtin/Object.js18
1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/builtin/Object.js b/js/src/builtin/Object.js
index 9ed1be0e1..c4739037e 100644
--- a/js/src/builtin/Object.js
+++ b/js/src/builtin/Object.js
@@ -202,3 +202,21 @@ function ObjectLookupGetter(name) {
// Step 3.d. (implicit)
}
+
+// Stage 4 draft 2020-09-06 https://tc39.github.io/proposal-object-from-entries/
+// Object.fromEntries (iterable)
+function ObjectFromEntries(iter) {
+ // We omit the usual step number comments here because they don't help.
+ // This implementation inlines AddEntriesFromIterator and
+ // CreateDataPropertyOnObject, so it looks more like the polyfill
+ // than the step-by-step spec algorithm.
+ const obj = {};
+
+ for (const pair of allowContentIter(iter)) {
+ if (!IsObject(pair))
+ ThrowTypeError(JSMSG_INVALID_MAP_ITERABLE, "Object.fromEntries");
+ _DefineDataProperty(obj, pair[0], pair[1]);
+ }
+
+ return obj;
+}