Send an unknown method call: Difference between revisions
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(→Tcl: Added implementation) |
(→{{header|Ruby}}: Show that Object#send can call private methods.) |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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You may replace :foo, :bar or "foo" with any expression that returns a Symbol or String. |
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<lang ruby>class Example |
<lang ruby>class Example |
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def foo |
def foo |
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symbol = :foo |
symbol = :foo |
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Example.new.send symbol # => 42 |
Example.new.send symbol # => 42 |
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Example.new.send( :bar, 1, 2 ) { |x,y| x+y } # => 3 |
Example.new.send( :bar, 1, 2 ) { |x,y| x+y } # => 3 |
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args = [1, 2] |
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Example.new.send( "bar", *args ) { |x,y| x+y } # => 3</lang> |
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Object#send can also call protected and private methods, skipping the usual access checks. Ruby 1.9 adds Object#public_send, which only calls public methods. |
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{{works with|Ruby|1.9}} |
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<lang ruby>class Example |
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private |
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def privacy; "secret"; end |
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public |
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def publicity; "hi"; end |
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end |
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e = Example.new |
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e.public_send :publicity # => "hi" |
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e.public_send :privacy # raises NoMethodError |
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e.send :privacy # => "secret"</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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