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class Method
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Parent:
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Object
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Version:
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1.6
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Index:
[ ]
arity
call
to_proc
Method objects are created by
Object#method
, and are associated
with a particular object (not just with a class). They may be used
to invoke the method within the object, and as a block associated with
an iterator.
class Thing
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def square(n)
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n*n
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end
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end
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aThing = Thing.new
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aMethod = aThing.method("square")
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aMethod.call(9)
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� |
81
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[ 1, 2, 3 ].collect(&aMethod)
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� |
[1, 4, 9]
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instance methods
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[ ]
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meth[ [
args
]*
]
-> anObject
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Synonym for Method.call.
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arity
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meth.arity -> aFixnum
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Returns an indication of the number of arguments accepted by a method.
Returns a nonnegative integer for methods that take a fixed number
of arguments. For Ruby methods that take a variable number of
arguments, returns -n-1, where n is the number of required
arguments. For methods written in C, returns -1 if the call
takes a variable number of arguments.
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call
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meth.call( [
args
]*
)
-> anObject
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Invokes the meth with the specified
arguments, returning the method's return value.
m = 12.method("+")
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m.call(3)
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� |
15
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m.call(20)
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� |
32
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to_proc
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meth.to_proc -> aProc
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Returns a Proc object corresponding to this method.
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