[GROOVY-2703] Add putEach method to Map

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.5.4
• Fix Version/s: 1.6.1, 1.7.0
• Component/s: groovy-jdk
• Assignee: Paul King
• Reporter: Jim LoVerde
• Created: 23/Mar/08 01:41
• Updated: 07/Apr/15 19:13
• Resolved: 06/Apr/09 06:46

Description

I've frequently run across the situation where I want to create a map from two equal sized lists, using one list for the keys and a second list for the values.

Maybe I'm missing something, but I can't seem to find a compact way to do this that doesn't require a for loop or an intermediate variable. The best I've come up with is to add this method to Map:

Map.metaClass.putEach = { List keylist, List valuelist ->
assert keylist.size == valuelist.size
for (int i=0; i < keylist.size; i++)

{ delegate.put(keylist[i], valuelist[i]) }

delegate
}

This allows you to just call putEach on any Map passing in two equal sized lists, e.g.:

assert [:].putEach(['key1', 'key2', 'key3'], ['value1', 'value2', 'value3']) == ['key1':'value1', 'key2':'value2', 'key3':'value3']

Since this seems generally useful, it might be something worth adding to the base GDK.