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From CFouts <chrisfo...@ziftsolutions.com>
Subject Re: Strategy for optionally excluding a named method parameter?
Date Sun, 26 Apr 2020 03:30:25 GMT
It’s doing what you programmed it to do.

 

You’re doing a “println” on the first arg (args.one), then a print on the second arg
(args.two.

 

So on your first 2 calls…

 

f(one: “string”, two: false), prints

     string (the line fieed in println)

     false (no linefeed)

 

then f(one: “string”, two: true), prints

                                        string (linefeed)

      true

 

So if you combine the outputs, it’s indeed

 

     string (the line fieed in println)

     false (print, no linefeed) string (linefeed)

      true

 

So. w/o the explanations,  looks exactly what you have

     string

     false string

     true

 

From: Rathinavelu <rathinavelu@gmail.com>
Reply-To: <users@groovy.apache.org>
Date: Saturday, April 25, 2020 at 9:23 PM
To: "users@groovy.apache.org" <users@groovy.apache.org>, "users@groovy.apache.org" <users@groovy.apache.org>,
David Karr <davidmichaelkarr@gmail.com>
Subject: RE: Re: Strategy for optionally excluding a named method parameter?

 

Both named and varag

 

def f(Object[] args){ println args.one

print args.two }

f(one: "string",two:false)

f(one:"string", two:true)

f(two:false)

f(two:true)

f(two: 1==2)

f(two: 1==1)

f(two: 1==2)

 

[string]

[false][string]

[true][null]

[false][null]

[true][null]

[false][null]

[true][null]

[false]

 

Please as a work around keep the boolean as the last parameter. Since map is a subclass of
 Object, the function polymorphically accepts map object . But why Boolean be the last to
work? Sorry, Sir! I am into groovy only from last week! A long way to go!

The reason for always ‘false’ in the middle perhaps  is “invisible input”. Last output
has no [null]

T.Rathinavelu

 

Sent from Mail for Windows 10

 

From: MG
Sent: Sunday, April 26, 2020 5:00 AM
To: users@groovy.apache.org; David Karr
Subject: Re: Strategy for optionally excluding a named method parameter?

 

Hi David,

since, as was mentioned, named parameters are implemented as a map underneath in Groovy, you
should be able to remove the map entry of the parameter you do not want to pass, though I
did not try this myself...

Cheers,
mg


On 25/04/2020 20:57, David Karr wrote:

 

 

On Sat, Apr 25, 2020 at 2:00 AM Rathinavelu <rathinavelu@gmail.com> wrote:

Named parameters are not available in Groovy, say, as in Python., though they say it is. Groovy
has only mapped parameters. The earlier mail works for a single ‘named’ parameter; if
there are more parameters Groovy does not work as ‘expected’; it treats them only as positional
parameters.

Kindly mail me an use-case.

T.Rathinavelu

 

The code sample looks something like this:

 

    functionName param1: value,

        param2: value,

        param3: value,

        param4: value,

        ...

        param25: value

 

For instance, we need to make either the previous call or the following:

 

    functionName param1: value,

        param2: value,

        param3: value,

        ... 

        param25: value

 

Where the "param4" key and value are not provided.  Presently, we have an "if" checking for
a condition, followed by the "true" block with the first version of the function call with
25 parameters, followed by the "else" and the "false" block with the second version, which
has 24 parameters, all the same values as in the first block, except for the one key and value
not provided in the second version.

 

 

Sent from Mail for Windows 10

 

From: David Karr
Sent: Saturday, April 25, 2020 1:48 AM
To: users@groovy.apache.org
Subject: Strategy for optionally excluding a named method parameter?

 

Lately my only Groovy work is scripted pipelines in Jenkins, version 2.89.4 .

 

I'm working with an api that is somewhat dumb in one respect.  The method we call takes ~25
parameters.  We send them as named parameters. One of the parameters is of boolean type. 
What we've discovered from testing is that if we send a value as either "true" or "false",
it acts as if we sent "true".  If we construct the call without that parameter entirely, it
acts as if we sent "false". I tried making it send null, but that just causes it to fail at
runtime.  We presently have an "if" for that one flag, with two calls to the method, one taking
25 parameters, the other taking 24.  It is really obnoxious.

 

Obviously, the proper fix is to change their api so that it works correctly.  The reality
is, that's not going to happen any time soon in geological terms.

 

Is there a concise groovy syntax we could use that would optionally include or exclude a single
parameter to the method?

 

 

 

 


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