`Extract`¶

Extracts parts at specified positions.

$ wo 'Extract[{a, b, c, d}, 2]'
b

$ wo 'Extract[{a, {b1, b2, b3}, c, d}, {2, 3}]'
b3

A part extracted from a held expression evaluates once it leaves the wrapper.

$ wo 'Extract[Hold[1 + 2, 3 + 4], {2}]'
7

Extract¶