String API

String column names are the easiest way to access data in DataFrame:

DataFrame.read("titanic.csv")
    .add("lastName") { "name"<String>().split(",").last() }
    .dropNulls("age")
    .filter {
        "survived"<Boolean>() &&
            "home"<String>().endsWith("NY") &&
            "age"<Int>() in 10..20
    }

The titanic.csv file could be found here.

warning

Note that if data frame doesn’t contain column with the string provided, or you try to cast to the wrong type it will lead to runtime exception.