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Unscopables (ES6)

Category

JavaScript

Type

New or changed feature

Status

Enabled by default (Chrome 38)

Intent stage

None

Summary

Unscopables allows properties to be hidden to with statement lookup rules. This is important for adding new properties to existing objects both in JavaScript and in DOM.

Standards & signals

• Specification: http://www.ecma-international.org/ecma-262/6.0/#sec-symbol.unscopables
• Firefox: Positive
• Safari: Positive
• Web developers: Positive
• Tracking bug: https://code.google.com/p/v8/issues/detail?id=3401

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