document v8 4.2 es6 additions

[Fishrock123]

See nodejs/node#1610

[rajit]

Quick summary, in case it helps:

CLI Options

--harmony_modules (enable "harmony modules (implies block scoping)" (in progress))
type: bool default: false
--harmony_arrays (enable "harmony array methods" (in progress))
type: bool default: false
--harmony_array_includes (enable "harmony Array.prototype.includes" (in progress))
type: bool default: false
--harmony_regexps (enable "harmony regular expression extensions" (in progress))
type: bool default: false
--harmony_arrow_functions (enable "harmony arrow functions" (in progress))
type: bool default: false
--harmony_proxies (enable "harmony proxies" (in progress))
type: bool default: false
--harmony_unicode (enable "harmony unicode escapes" (in progress))
type: bool default: false
--harmony_unicode_regexps (enable "harmony unicode regexps" (in progress))
type: bool default: false
--harmony_computed_property_names (enable "harmony computed property names" (in progress))
type: bool default: false
--harmony_rest_parameters (enable "harmony rest parameters" (in progress))
type: bool default: false
--harmony_tostring (enable "harmony toString")
type: bool default: false
--harmony_numeric_literals (enable "harmony numeric literals")
type: bool default: true
--harmony_strings (enable "harmony string methods")
type: bool default: true
--harmony_scoping (enable "harmony block scoping")
type: bool default: true
--harmony_templates (enable "harmony template literals")
type: bool default: true
--harmony_classes (enable "harmony classes (implies block scoping & object literal extension)")
type: bool default: true
--harmony_object_literals (enable "harmony object literal extensions")
type: bool default: true

True-by-default

• Numeric literals (octal, binary & hexadecimal literals)
• String methods (.startsWith, .endsWith, .fromCodePoint, .codePointAt, .includes, .normalize, .repeat, .trimLeft, .trimRight, [@@iterator], .rawHi\n${2+3}``)
• Block scoping (let ...)
• Template literals (Hello, ${name})
• Classes (class Dog { bark() { ... } })
• Object literals ({ name, address, company })

[fhemberger]

@rajit Thanks, Rajit.

[bnb]

This is an issue that can be handled by the Docs WG. I've marked it as invalid and docs to ensure its responsibility is handed to the Docs WG. If you want to discuss this issue, see nodejs/docs#10.