Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Groovy: Picking a value from a number of options

DZone's Guide to

Groovy: Picking a value from a number of options

· Java Zone
Free Resource

Learn how to troubleshoot and diagnose some of the most common performance issues in Java today. Brought to you in partnership with AppDynamics.

Let’s say you need to define a value based on a number of conditions. If first condition holds true, then the value is X, if second condition holds true then the value is Y and so on. I used to go with a multi-level ternary operator to accomplish that:

def a = 2
def x = ( a == 1 ) ? 'aa' :
( a == 2 ) ? 'bb' :
( a == 3 ) ? 'cc' :
'dd'
assert x == 'bb'

Today @tim_yates has suggested a more debuggable way:

def a = 2
def x = a.with { switch( it ) {
case 1 : return 'aa'
case 2 : return 'bb'
case 3 : return 'cc'
default : return 'dd' }
}
assert x == 'bb'

Thanks, Tim! Will start using it now. This is very close to Scala version, which is even shorter:

val a = 2
val x = a match {
case 1 => "aa"
case 2 => "bb"
case 3 => "cc"
case _ => "dd"
}
assert ( x == "bb" )

 

From http://evgeny-goldin.com/blog/picking-value/

Understand the needs and benefits around implementing the right monitoring solution for a growing containerized market. Brought to you in partnership with AppDynamics.

Topics:

Opinions expressed by DZone contributors are their own.

The best of DZone straight to your inbox.

SEE AN EXAMPLE
Please provide a valid email address.

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.
Subscribe

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}