CODEWITHSUNDEEP
groovy
user3519173
user3519173

Reputation: 75

How to create method (function) in groovy with given params but not defined

I'm completly new to groovy, and to be honest I have real hard time with finding things in groovy. So i noticed that somethink like this can be achieve:

We have function

def static someMethod (params) {
...
}

and then you are able to call this one like this :

someMethod (param1 : value1, param2 : value2, param3 : value3....)

So my question is : how can I read those param1, param2 etc in my someMethod? I mean should I do something close to this ?

def static someMethod (params) {
def result = param1 + param2 + param3
}

And If someone let say dont give param3 will this function return nullPointerException? Like I said I'm new, so any answer is probably best (some links meaby?) Thanks in advance and sorry for my bad english.

Upvotes: 1

Views: 302

Answers (1)

Opal
Opal

Reputation: 84786

When You declare such method:

def static someMethod (params) {
   def result = params.param1 + params.param2 + params.param3
   println result
}

and then invoke like this:

someMethod (param1 : 1, param2 : 2, param3 :3)

what You pass to method invocation is map, so in the method's body there's a need to prefix key names with map name in this case params.

When no value is present for key - null will be returned, unless You define a map using withDefault - then default value will be returned.

Upvotes: 3

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