Sent: Sunday, April 26, 2020 9:00 AM
To: users@groovy.apache.org; David Karr
Subject: Re: Strategy for optionally excluding a named method parameter?
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
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
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:
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,
For instance, we need to make either the previous call or the following:
functionName param1: 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
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?
