Destructuring
Overview
Most of the magic of destructuring uses the splat (*) operator.
| Example | Result / comment |
|---|---|
a, b = [0,1] |
a=0, b=1 |
a, *rest = [0,1,2,3] |
a=0, rest=[1,2,3] |
a, * = [0,1,2,3] |
a=0 Equivalent to .first |
*, z = [0,1,2,3] |
z=3 Equivalent to .last |
Destructuring Block Arguments
triples = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
triples.each { |(first, second, third)| puts second }
# 2
# 5
# 8
triples.map { |(first, *rest)| rest.join(' ') } # => ["2 3", "5 6", "8 9"]