instance methods
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[ ] |
prc[ [params]* ]
-> anObject
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Synonym for Proc.call .
| arity |
prc.arity -> anInteger
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Returns the number of arguments required by the block. If the
block takes no arguments, returns -1. If it takes one argument,
returns -2. Otherwise, returns a positive argument count unless
the last argument is prefixed with *, in which case the argument
count is negated. The number of required arguments is
anInteger for positive values, and
( anInteger+1).abs otherwise.
Proc.new {||}.arity |
» |
0 |
Proc.new {|a|}.arity |
» |
-1 |
Proc.new {|a,b|}.arity |
» |
2 |
Proc.new {|a,b,c|}.arity |
» |
3 |
Proc.new {|*a|}.arity |
» |
-1 |
Proc.new {|a,*b|}.arity |
» |
-2 |
| call |
prc.call( [params]* )
-> anObject
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Invokes the block, setting the block's parameters to the values
in params using the same rules as used by parallel
assignment. Returns the value of the last expression evaluated
in the block.
aProc = Proc.new {|a, *b| b.collect {|i| i*a }} |
aProc.call(9, 1, 2, 3) |
» |
[9, 18, 27] |
aProc[9, 1, 2, 3] |
» |
[9, 18, 27] |
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