Finds the argument numbered by i within the given expression.
Empty() if that argument does not exist or is not specified.
Arg Expr() was deprecated in a previous release of JMP. Use Arg() instead.
Evaluates any expressions within expr, but leaves the outer expression unevaluated.
An expression with all the expressions inside expr evaluated.
A pattern that matches the specified pattern.
Head Expr() is deprecated. Use Head() instead.
Head Name Expr() is deprecated. Use Head Name() instead.
N Arg Expr() is deprecated. Use N Arg() instead.