Assign class variables with a loop in groovy

Question

I'm having some trouble figuring out how to accomplish what I am looking for. Let's say I have 5 different String variables: String string1 = "A"

String string2 = "B"

String string3 = "A"

String string4 = "B"

String string5 = "A"

What I want to do is loop over those 5 variables and if they equal B, I want to set them to A. What I have tried is something like:

[string1,string2,string3,string4,string5].each {
     if (it == "B"){
        //don't know what to put here
        need to set variable = "A" here
     }
}

I don't know how to get the actual variable name in the closure for the assignment. Maybe I am not searching correctly for what I am trying to do, but I need to be able to set strin2 and string4 to "A" with this loop.

I know I can do 5 if statements, but I know there has got to be a better way.

Do you want to change the object that variables like string1 point to, or do you want to leave that reference as it is and just put a new value in the List in place of the old one (which would not have any impact on the string1 reference)? — Jeff Scott Brown
– Jeff Scott Brown, Commented Dec 15, 2020 at 20:59
I want to change what it points to, from A to B. I don't care what the original value was. — jcattau
– jcattau, Commented Dec 15, 2020 at 21:01
@jcattau, it depends how you declared those string1-string5. if those are the members/properties of some object/map/script - then obj['string1'] = "B" will do the assignment. if they are the local variables - then no chance. — daggett
– daggett, Commented Dec 15, 2020 at 21:42

daggett · Accepted Answer · 2020-12-15 22:42:57Z

1

you can set an object (class) member with obj[property] = value if it's a groovy object or map

for example

@groovy.transform.ToString
class X {
    String string1 = "A"
    String string2 = "B"
    String string3 = "A"
    String string4 = "B"
    String string5 = "A"

    void switchAll(vOld,vNew){
        this.getProperties().each{k,v->
            if(k ==~ /string\d+/ && v==vOld) this[k] = vNew
        }
     }
     
}

def x = new X()
println x

x.switchAll("B","C")
println x

prints:

X(A, B, A, B, A)
X(A, C, A, C, A)

edited Dec 15, 2020 at 22:42

answered Dec 15, 2020 at 22:03

daggett

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3 Comments

jcattau Over a year ago

I'm going to see if I can work with this, but the strings1 through 5 may not always be "A" or "B", so I want to loop through them and check if they are "A" and if so change to "B". But these are local variables I was trying to work with.

daggett Over a year ago

there is a condition in my answer if( ... v==vOld). and you mentioned in your question that it's a class variables. with local variables - nothing will work.

jcattau Over a year ago

I'm sorry, I know enough about development for automated testing but still struggle with some concepts. They are class variables declared in the class, not local variables. I mixed up the concept.

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