#eachを使ったら負け

Transcript

1. 1.

   #eachΛ࢖ͬͨΒෛ͚

2. 2.

   GPSΛ࢖͍·͠ΐ͏

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   ʜ͡Όͳͯ͘

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   FBDI
   Λ࢖͏ͱ͍͏͜ͱ͸

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   &OVNFSBCMFΛ࢖͍ͬͯͳ͍ͬͯ͜ͱ

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   &OVNFSBCMFΛ΋ͬͱ࢖͍·͠ΐ͏

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   Enumerable.instance_methods.sort => [:all?, :any?, :chunk, :collect, :collect_concat, :count, :cycle, :detect,

   :drop, :drop_while, :each_cons, :each_entry, :each_slice, :each_with_index, :each_with_object, :entries, :find, :find_all, :find_index, :first, :flat_map, :grep, :group_by, :include?, :inject, :map, :max, :max_by, :member?, :min, :min_by, :minmax, :minmax_by, :none?, :one?, :partition, :reduce, :reject, :reverse_each, :select, :slice_before, :sort, :sort_by, :take, :take_while, :to_a, :zip]
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   FBDIࢦ਺

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   IUUQTHJTUHJUIVCDPN

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    6TBHF

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    None
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    RVJDL
    EFNP

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    ஫ҙɿશવݡ͘ͳ͍ूܭํ๏

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    ack --no-group --ruby "<method>[\s\.\{\(=]" <dir>

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    &OVNFSBCMFͷϝιου໊ͱ ඃͬͨΒ਺͑ͯ͠·͏

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    ΋ͬͱ&OVNFSBCMFʹ͍ͭͯ஌Γ͍ͨਓ΁

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    IUUQSVCZEPDPSHDPSF&OVNFSBCMFIUNM

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    $3VCZ
    enum.c

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    3VCJOJVT
    kernel/common/enumerable*.rb

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    ͓·͚ɿ ͓͢͢Ίͷ&OVNFSBCMFϝιου

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    #each_with_object # Better than inject for building hashes %w(one two

    three).each_with_object({}) {|w, hash| hash[word] = word.length } # => {"one"=>3, "two"=>3, "three"=>5}