60 lines
1.1 KiB
Text
60 lines
1.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Pcollect}
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Apply a function to a pattern@section{categories}
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Streams-Patterns-Events>Patterns>Filter
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@section{related}
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Classes/Pselect, Classes/Preject
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@section{description}
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Modifies each value by passing it to the function.
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@section{classmethods}
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@section{method}
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new
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@section{argument}
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func
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A link::Classes/Function::. Receives values from
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@racketblock[pattern::.
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]
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@section{argument}
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pattern
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A link::Classes/Pattern::.
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@section{examples}
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@racketblock[
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(
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a = Pcollect( { |item| item * 3 }, Pseq( #[ 1, 2, 3 ], inf ) );
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x = a.asStream;
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9.do( { x.next.postln; } );
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)
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::
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The message ]
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@racketblock[collect:: returns a Pcollect when passed to a pattern. Note that because the pattern is converted to a link::Classes/Stream:: (more precisely a link::Classes/FuncStream::) the collect function is evaluated for one item each time the message ]
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@racketblock[next:: is passed.
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]
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@racketblock[
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(
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a = Pseq( #[ 1, 2, 3 ], inf ).collect( { arg item; item * 3 } );
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a.postln;
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x = a.asStream;
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9.do( { x.next.postln; } );
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)
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::
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]
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