Use of ^^

[Jesse Johnson]

Hi,

I have searched the book, looked online, and searched the manual, and I cannot find the meaning of ^^ in the statement:

wholeNumber ^^ { s => SNum(s.toInt) }

It is probably something really simple that is driving me crazy. Any help?

Thanks,

Jesse

[Rafael Trindade Chiappetta]

I know that ^ is a binary XOR operator, but I have never used it.

https://www.tutorialspoint.com/scala/scala_operators.htm

=====
Rafael Trindade Chiappetta

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[Rex Kerr]

When you ask questions like this it is _really_ important to say what the context is, because any library can define its own ^^ operator.  Alternatively, you can search using symbolhound which indexes crazy stuff like this.

Anyway, it turns out that you are looking at Scala's parser combinator code.  ^^ basically means map--take your existing parser and tell it to apply some function to its contents (generating a new parser that does this mapping).

That it is called ^^ instead of map is one of about a million reasons you should always use FastParse instead of the old parser combinators.

  --Rex

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[Adriaan Moors]

Right, what Rex said -- methods can have symbolic names. This particular one is likely defined here: https://github.com/scala/scala-parser-combinators/blob/1.0.x/shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala#L370

On Thu, Sep 29, 2016 at 8:41 AM Rafael Trindade Chiappetta <rafae...@gmail.com> wrote:

I know that ^ is a binary XOR operator, but I have never used it.

https://www.tutorialspoint.com/scala/scala_operators.htm

=====

Rafael Trindade Chiappetta

On Thu, Sep 29, 2016 at 11:46 AM, Jesse Johnson <jesse.ala...@gmail.com> wrote:

Hi,

I have searched the book, looked online, and searched the manual, and I cannot find the meaning of ^^ in the statement:

wholeNumber ^^ { s => SNum(s.toInt) }

It is probably something really simple that is driving me crazy. Any help?

Thanks,

Jesse

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[Dennis Haupt]

if i were you, i would have this code open in my ide and just use "jump to declaration"

 

Gesendet: Donnerstag, 29. September 2016 um 17:44 Uhr
Von: "Adriaan Moors" <adr...@lightbend.com>
An: "Rafael Trindade Chiappetta" <rafae...@gmail.com>, "Jesse Johnson" <jesse.ala...@gmail.com>
Cc: scala-user <scala...@googlegroups.com>
Betreff: Re: [scala-user] Use of ^^

[Jesse Johnson]

Gentlemen,

Thank you for your extremely helpful answers to my question. I appreciate the assistance.

Thanks,

Jesse

[Naftoli Gugenheim]

Hi, I guess your actual question was answered but for the future, most internet search engines aren't helpful for symbols but there's one that is: symbolhound. If you search in symbolhound for "^^ scala" you get this page http://symbolhound.com/?q=%5E%5E+scala which has some helpful links.