src/runtime.js - Issue 771483002: Implement ES6 @@isConcatSpreadable

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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: Move implementation to C++ to fix speed issue Created 6 years ago

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Index: src/runtime.js

diff --git a/src/runtime.js b/src/runtime.js

index 4d15d205a495b6623cf399ccd0dd36973cac22c4..192ac353c4b5d4a46c58208ef4ed245838f80a24 100644

--- a/src/runtime.js

+++ b/src/runtime.js

@@ -614,6 +614,15 @@ 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)) {