Ruby Language Iteration Iterating over complex objects
Example
Arrays
You can iterate over nested arrays:
[[1, 2], [3, 4]].each { |(a, b)| p "a: #{ a }", "b: #{ b }" }
The following syntax is allowed too:
[[1, 2], [3, 4]].each { |a, b| "a: #{ a }", "b: #{ b }" }
Will produce:
"a: 1"
"b: 2"
"a: 3"
"b: 4"
Hashes
You can iterate over key-value pairs:
{a: 1, b: 2, c: 3}.each { |pair| p "pair: #{ pair }" }
Will produce:
"pair: [:a, 1]"
"pair: [:b, 2]"
"pair: [:c, 3]"
You can iterate over keys and values simultaneously:
{a: 1, b: 2, c: 3}.each { |(k, v)| p "k: #{ k }", "v: #{ k }" }
Will produce:
"k: a"
"v: a"
"k: b"
"v: b"
"k: c"
"v: c"
