Ratpacked: Conditionally Map Or Flatmap A Promise

When we want to transform a Promise value we can use the map and flatMap methods. There are also variants to this methods that will only transform a value when a given predicate is true: mapIf and flatMapIf. We provide a predicate and function to the methods. If the predicate is true the function is invoked, otherwise the function is not invoked and the promised value is returned as is.

In the following example we have two methods that use the mapIf and flatMapIf methods of the Promise class:

Now we take a look at the following specification to see the result of the methods with different input arguments:

Written with Ratpack 1.4.5.

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About mrhaki

My name is Hubert A. Klein Ikkink also known as mrhaki. I work at the great IT company JDriven. Here I work on projects with Groovy & Grails, Gradle and Spring. At JDriven we focus on SpringSource technologies. All colleagues want to learn new technologies, support craftmanship and are very eager to learn. This is truly a great environment to work in. You can contact me via Google+ or @mrhaki.

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