Patterns & destructuring

Patterns and destructuring: the atoms a match arm accepts, type and alias patterns, and the object and array destructuring forms.

Return to the grammar overview.

Terms#

These are the words you write in this part of the language. Each links to its page. The second column names the grammar rule the word belongs to.

Term	Grammar rule
`and`	`patterns`
`or`	`pattern`
`const`, `as`, `var`	`ut_pattern`
`as`	`pattern_binding`
`rest`, `as`	`pattern_property`
`rest`	`array_pattern_element`

Formal grammar#

The rules for this part of the language are the parser's own definition of it. They are written for models and tools, so this page does not repeat them; the full list is at every production.