I have this map function as part of my stream. parse.apply is basically doing Double::valueOf. My intelliJ suggest me I can replace statement lambda with regular expression Lambda.
.map(x -> { return StringUtils.isEmpty(x) ? parse.apply("0") : parse.apply(x);
})
If I didn't not have to worry about empty strings I could have done:
.map(parse::apply). How do I do in this case?
You can filter out all empty strings before reaching .map:
.filter(s -> !StringUtils.isEmpty(s))
.map(parse)
EDIT: if you want to replace empty strings with "0", then simply split one map into two separate operations. It won't affect efficiency and will make your code much easier to understand from functional programming point of view:
.map(s -> StringUtils.isEmpty(s) ? "0": s)
.map(parse)
EDIT2: when you call Double::valueOf you have to be aware that it can throw java.lang.NumberFormatException if given string has no double representation. Be aware of it.
