Destructuring - Ruby Full Tutorial

Ruby - Destructuring

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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"]

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https://develop.horje.com/learn/1434/reference