Menu
I've got the following code on a Controller
def db = new Sql(dataSource) def rawLines = db.rows("SELECT name FROM LINES") def lines = [] /*(db.rows returns the values as [NAME:value] */ rawLines.each { lines.add(it.name) } /*Then, use lines */ I can't keep away the impression that there is probably some way to do this in a more elegant way, something similar to a list comprehension in Python:
lines = [ l.name for l in db.rows("SELECT name FROM LINES") ] Having to declare an empty list and then populate it doesn't seem the best way of doing things... Is it possible to do something like this, or Groovy doesn't allow it?
319
Combine lists using the plus operator The plus operator will return a new list containing all the elements of the two lists while and the addAll method appends the elements of the second list to the end of the first one. Obviously, the output is the same as the one using addAll method.
In Groovy, the List holds a sequence of object references. Object references in a List occupy a position in the sequence and are distinguished by an integer index. A List literal is presented as a series of objects separated by commas and enclosed in square brackets.
Groovy - indexOf() Returns the index within this String of the first occurrence of the specified substring. This method has 4 different variants. public int indexOf(int ch) − Returns the index within this string of the first occurrence of the specified character or -1 if the character does not occur.
Can't you just use the spread operator, and do:
lines = rawLines*.name (see http://docs.groovy-lang.org/latest/html/documentation/index.html#_spread_operator)
149
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
