Is there a better way to map a Ruby hash? I want to iterate over each pair and collect the values. Perhaps using tap?
hash = { a:1, b:2 }
output = hash.to_a.map do |one_pair|
k = one_pair.first
v = one_pair.last
"#{ k }=#{ v*2 }"
end
>> [
[0] "a=2",
[1] "b=4"
]
Ruby's hash includes the Enumerable module which includes the map
function.
hash = {a:1, b:2}
hash.map { |k, v| "#{k}=#{v * 2}" }
嗯,是的,使用map
,直接在散列上调用:
{ a:1, b:2 }.map { |k,v| "#{k}=#{v*2}" } # => [ 'a=2', 'b=4' ]
hash = { a:1, b:2 }
hash.map{|k,v| [k,v*2]* '='}
# => ["a=2", "b=4"]
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