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Unified Diff: src/runtime.js

Issue 771483002: Implement ES6 @@isConcatSpreadable (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Fix holey sloppy-arguments case Created 6 years ago
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Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index c9cf825038a95ab642808b5ea027553e3b514b35..ab16aafbbf642553f62118dd1179e2db5514a8d6 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -617,6 +617,15 @@ function IsPrimitive(x) {
}
+// ES6, draft 10-14-14, section 22.1.3.1.1
+function IsConcatSpreadable(O) {
+ if (!IS_SPEC_OBJECT(O)) return false;
+ var spreadable = O[symbolIsConcatSpreadable];
+ if (IS_UNDEFINED(spreadable)) return IS_ARRAY(O);
+ return ToBoolean(spreadable);
+}
+
+
// ECMA-262, section 8.6.2.6, page 28.
function DefaultNumber(x) {
if (!IS_SYMBOL_WRAPPER(x)) {
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