First stage

First is the operation that returns first object from the sequence or throws an exception if the sequence does not contain elements.

FirstStage syntax

First
  : 'first' '(' LambdaExpression? ')'  
  ;

Related tokens
LambdaExpression

First examples

1. Find a table cell with the text 'Alex'. Throws when not found.

   select(tableCells) // PdfTableCell[]
       ->first((item) => item.Text() == 'Alex') // PdfTableCell