[[.fseq: Extract function(s) from a functional sequence.
Description
Functional sequences can be subset using single or double brackets.
A single-bracket subset results in a new functional sequence, and
a double-bracket subset results in a single function.
Usage
# S3 method for fseq
[[(x, ...)# S3 method for fseq
[(x, ...)
Arguments
...
index/indices. For double brackets, the index must be of length 1.
Value
A function or functional sequence.