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Ruby 2.7ΫΠζ
@hiromichinomata
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ύλʔϯϚον
case {a: 0, b: 1, c: 2}
in {a: 0, i: 1}
puts 1
in {a: 0, b: tmp}
puts 2
in {a: 0, b: 1, c: tmp}
puts 3
in {a: 0, b: 1, c: 2}
puts 4
end
ग़ྗ͞ΕΔจࣈ?
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ύλʔϯϚον
case {a: 0, b: 1, c: 2}
in {a: 0, i: 1}
puts 1
in {a: 0, b: tmp}
puts 2
in {a: 0, b: 1, c: tmp}
puts 3
in {a: 0, b: 1, c: 2}
puts 4
end
͑: 2
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irbʹՃ͞Εͨͷ?
1. ෳߦฤू
2. readline͕ෆཁʹ
3. ΫϥεɺϞδϡʔϧɺϝιουͷϦϑΝϨϯεΛͦͷ
Ͱ֬ೝͰ͖ΔΑ͏ʹ
4. inspect݁Ռʹ৭͕ͭ͘Α͏ʹ
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irbʹՃ͞Εͨͷ?
1. ෳߦฤू
2. readline͕ෆཁʹ
3. ΫϥεɺϞδϡʔϧɺϝιουͷϦϑΝϨϯεΛͦͷ
Ͱ֬ೝͰ͖ΔΑ͏ʹ
4. inspect݁Ռʹ৭͕ͭ͘Α͏ʹ
͑: શ෦
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ΩʔϫʔυҾͱͯ͠ڐ༰͞Ε
Δͷ?
1. def foo(h, **kw); end; foo(key: 42)
2. def foo(h, key: 42); end; foo(key: 42)
3. def foo(**kw); end; foo({key: 42})
4. def foo(h, key: 42); end; foo({key: 42})
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ΩʔϫʔυҾͱͯ͠ڐ༰͞Ε
Δͷ?
1. def foo(h, **kw); end; foo(key: 42)
2. def foo(h, key: 42); end; foo(key: 42)
3. def foo(**kw); end; foo({key: 42})
4. def foo(h, key: 42); end; foo({key: 42})
=>
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Ruby 2.7ΛίϯύΠϧ͢Δͷʹඞ
ཁͳͷ?
1. C90
2. C99
3. C11
4. C17
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Ruby 2.7ΛίϯύΠϧ͢Δͷʹඞ
ཁͳͷ?
1. C90
2. C99
3. C11
4. C17
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ิ: C99৽ػೳྫ
* มએݴ͕ϒϩοΫͷઌ಄͚ͩͰͳ͍͍ͨ͘
ͱ͖ʹએݴՄೳʹ
* forจͷΧϯλมΛࣄલʹએݴෆཁʹ
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ूܭϝιου
["a", "b", "c", "b"].xxx
#=> {"a"=>1, "b"=>2, "c"=>1}
1. count_map
2. sum_map
3. pally
4. tally
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ूܭϝιου
["a", "b", "c", "b"].xxx
#=> {"a"=>1, "b"=>2, "c"=>1}
1. count_map
2. sum_map
3. pally
4. tally
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ิ
• ӳޠͰtallyצఆɺूܭ͢Δͱ͍͏ҙຯ
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൪߸ࢦఆύϥϝλʔ
[1,4,3].map{puts xxx}
# =>
1
4
3
1. _0
2. _1
3. $0
4. $1
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൪߸ࢦఆύϥϝλʔ
1. _0
2. _1
3. $0
4. $1
[1,4,3].map{puts xxx}
# =>
1
4
3
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ࢀߟ
• https://www.ruby-lang.org/ja/news/
2019/12/25/ruby-2-7-0-released/