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<
depesz >
hi. having hash: {"key" => [1, 2,3,4], "other" => [5,6,7,8]} - is there any transformation that I could do to change it into: {"1" => "key", "2" => "key", …, "8" => "other"} ?
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<
leftylink >
if you asked me to do this, I would flat_map then to_h the result
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<
gr33n7007h >
depesz: h.each_with_object({}) { |(k, v), h| h[v.shift] = k until v.empty? }
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<
havenwood >
Or the way leftylink mentioned usually pairs with an internal simple #map, but you can alternatively #zip.
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<
havenwood >
h.flat_map { _2.zip([_1].cycle) }.to_h
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gr33n7007h >
just about to note it'll mutate the original hash
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<
havenwood >
h.flat_map { |key, values| values.map { |value| [value, key] } }.to_h
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havenwood >
^ what I presumed with the original suggestion. Seems reasonable. :)
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<
havenwood >
gr33n7007h: I'd probably just modify yours to iterate over values rather than shifting them.
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<
havenwood >
h.each_with_object({}) { |(key, values), result| values.each { |value| result[value] = key } }
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<
gr33n7007h >
havenwood: me too come to think of it =)
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<
nakilon >
.flat_map{ |*k,v| k.product(v).map(&:reverse) }.to_h
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<
nakilon >
.flat_map{ |*k,v| v.product k }.to_h
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<
depesz >
gr33n7007h: thanks.
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<
depesz >
and leftylink , and havenwood :)
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<
depesz >
and nakilon :)
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<
havenwood >
nakilon: I too often forget #product exists. That's nice.
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<
havenwood >
h.flat_map{ _2.product([_1]) }.to_h
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<
havenwood >
I don't mind positional arguments here since what's a key becomes a value, diluting any meaning.
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<
havenwood >
Salves a method call from: h.flat_map { _2.zip([_1].cycle) }.to_h
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<
havenwood >
And a bit of reduced cognitive overhead is nice.
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