Apply function to all elements of a WrappedArray elegantly

Question

This:

val checkValue = udf { (array: WrappedArray[String], value: String) => array.contains(value) }

works if you do not worry about case of words.

I can apply .toLowerCase() to value easily enough to get this ...(value.toLowerCase() )

But how to apply to the incoming array being WrappedArray and not externally?

`array.iterator.map(_.toLowerCase).contains(value.toLowerCase)`? — Luis Miguel Mejía Suárez, Sep 23 '20 at 19:38
Well, it was so obvious in my mind that I was sure it wouldn't work for some reason :p — Luis Miguel Mejía Suárez, Sep 23 '20 at 19:54
@LuisMiguelMejíaSuárez well so be it, but the point was "elegant" — thebluephantom, Sep 23 '20 at 20:03

Andrey Tyukin · Accepted Answer · 2020-09-23T21:22:18.970

0

array.contains(value)

is the same as

array.exists(_ == value)

The _ == value can be replaced by an arbitrary predicate.

In your case, it would be something like

array.exists(value.equalsIgnoreCase)

Also, note that "ß".toUpperCase == "SS" is true, whereas "ß" == "SS".toLowerCase and "ß".compareIgnoreCase("SS") are both false, see for example this answer.

edited Sep 23 '20 at 21:22

answered Sep 23 '20 at 19:39

Andrey Tyukin

43,673
4
57
93

Apply function to all elements of a WrappedArray elegantly

1 Answers1