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Elixir文字列まとめ

Posted at 2016-09-11

##Elixirの文字列まとめ
A String in Elixir is a UTF-8 encoded binary.

###普通に表示

hello.exs

IO.puts "Hello, World!"

###文字列結合

####文字列同士の結合

string1.exs

# "YamadaTaro"
IO.puts "Yamada " <> "Taro"

####指定文字列での結合

string2.exs

res1 = Enum.join(["abc", "efg", "hij"], "-")
res2 = Enum.join(["abc", "efg", "hij"], ",")
# "abc-efg-hij"
IO.puts res1
# "abc,efg,hij"
IO.puts res2

###インデックスアクセス

string3.exs

# "i"
IO.puts String.at "Elixir", 2

###最初の文字、最後の文字にアクセス

string4.exs

# E
IO.puts String.first "Elixir"
# r
IO.puts String.last "Elixir"

###部分文字列

string5.exs

# Eli
IO.puts String.slice "Elixir", 0, 3

###文字列への式展開

string6.exs

a = "Elixir"
# "Hello Elixir"
IO.puts "Hello #{a}"

###文字列の長さ

string7.exs

# 6
IO.puts String.length "Elixir"

###指定文字での分割

string8.exs

hello = String.split "Hello,Elixir!", ","
# Hello
IO.puts hd hello
# Elixir!
IO.puts tl hello

###バイト数確認

string9.exs

# 6
IO.puts byte_size "Elixir"

###大文字・小文字変換

string10.exs

# "ELIXIR"
IO.puts String.upcase "elixir"
# elixir
IO.puts String.downcase "ELIXIR"

###置換

string11.exs

# hello Elixir!
IO.puts String.replace "hello elixir!", "elixir", "Elixir"