$.checked_list | R Documentation |
A checked list is a sub class of list access operator that throws an error if you attempt to access a value that does not exist (rather than returning NULL) the point of this is to throw errors early if the data changes.
## S3 method for class 'checked_list'
x$y
x |
the list |
y |
the item |
the value of the list item or an error if it does not exist
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