Java 8 Stream - How to return replace a strings contents with a list of items to find

Question

I wish to replace the code below using java8 .stream() or .foreach(). However I am having trouble doing this.

Its probably very easy, but I'm finding the functional way of thinking a struggle :)

I can iterate, no problem but the but returning the modified string is the issue due to mutability issues.

Anyone have any ideas ?

List<String> toRemove = Arrays.asList("1", "2", "3");
String text = "Hello 1 2 3";

for(String item : toRemove){
    text = text.replaceAll(item,EMPTY);
}

Thanks !

Answer 1

text = toRemove.stream()
               .reduce(text, (str, toRem) -> str.replaceAll(toRem, ""));

would work for you.

Answer 2

Since you can’t use the stream to modify the text variable you have to coerce the operation into one Function which you can apply to the text to get the final result:

List<String> toRemove = Arrays.asList("1", "2", "3");
String text = "Hello 1 2 3";
text=toRemove.stream()
             .map(toRem-> (Function<String,String>)s->s.replaceAll(toRem, ""))
             .reduce(Function.identity(), Function::andThen)
             .apply(text);