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kangax/gist:551953

Created August 26, 2010 18:48
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###Object.preventExtensions

  • Make object non-extensible (can't add properties)

###Object.seal

  • Make object non-extensible (can't add properties)
  • Make object's own properties non-configurable (can't remove them, or change their nature and/or attributes)

###Object.freeze

  • Make object non-extensible (can't add properties)
  • Make object's own properties non-configurable (can't remove them, or change their nature and/or attributes)
  • Make object's own properties non-writable (aka, read-only)
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