Add two maps in Groovy while summing up values for common keys

Question

I have two maps in Groovy [a: 1, b: 2] and [b:1, c:3] and would like to create from them a third map [a: 1, b: 3, c: 3]. Is there a Gr

Answer 1

I don't think there's a ready-made method for this, maybe use something like:

def m1 = [a: 1, b: 2]
def m2 = [b: 1, c: 3]
def newMap = (m1.keySet() + m2.keySet()).inject([:]) { 
    acc, k -> acc[k] = (m1[k] ?: 0) + (m2[k] ?: 0); acc 
}