[GROOVY-1510] Add groupBy() method to filter lists according to a critieria

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0-JSR-6
• Fix Version/s: 1.0-RC-1
• Component/s: groovy-jdk
• Assignee: Guillaume Sauthier
• Reporter: Guillaume Sauthier
• Created: 25/Sep/06 15:17
• Updated: 25/Sep/06 15:21
• Resolved: 25/Sep/06 15:21

Description

Regroup elements according to a closure criteria inside a map index by the value of the criteria.

def expected = [Integer: [1, 2], String: ["a", "b"], BigDecimal: [3.5, 4.6]]

def list = [1, "a", 2, "b", 3.5, 4.6]

def result = list.groupBy

{ it.class }

assert [1, 2] == result[Integer]
assert ["a", "b"] == result[String]
assert [3.5, 4.6] == result[BigDecimal]
assert 3 == result.size()