JSintroes2015
Destructuring
Unpack, in place.
Pull values out of objects and arrays directly into named bindings — with renames, defaults, nesting, and rest patterns layered on top.
Object destructuring with rename and default
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One statement pulls four bindings out of user: company is renamed to employer, role defaults to Engineer because the source has no role key, and city is reached through a nested pattern — so the output reads "role":"Engineer","city":"London".