 pattern matching or defining functions, you can use `_` to ignore a value. Here's an example:\\n\\n```gren\\nlength : Array a -> Int\\nlength array =\\n    Array.foldl (\\\\_ len -> len + 1) 0 array\\n```\\n\\nSometimes, it can be helpful to attach a name to the ignored value, as a reminder for what the value represents. In 0.2, you can do just that:\\n\\n```gren\\nlength : Array a -> Int\\nlength array =\\n    Array.foldl (\\\\_value len -> len + 1) 0 array\\n```\\n\\nNote: trying to use `_value` will tri