CODEWITHSUNDEEP
grailscollectionsgroovygrails-orm
drago
drago

Reputation: 1207

Grails collections

I want to check if any of curently logged in user roles are in specific list of roles. But it can be any two collection.

Basically I want to check if any memeber of [x1,x3,x4] collection is contained in [x2,x3,x7]

How to do this in Groovy (Grails)?

Upvotes: 1

Views: 913

Answers (4)

Allen Li
Allen Li

Reputation: 1

def a = [1,2,3] 
    def b = [3,4,5]
    def result = false 
    a.each{it->
         if(b.contains(it))
         result =true
    }
    return result

Upvotes: 0

epidemian
epidemian

Reputation: 19229

You can use the Collection#disjoint method:

def a = [5, 4, 3]
def b = [7, 6, 5]

// a contains a member of b if they are not disjoint.
assert !a.disjoint(b)
assert a.disjoint([8, 7, 6])

Other alternatives are !a.intersect(b).empty or a.any { it in b } but i think the disjoint solution is the most direct one and (wild speculation here) probably the most performant one as it doesn't need intermediate collections or closures (update: well, the code for disjoint reveals that it does some some funky stuff under the hood... but then again nearly all Groovy methods do =P).

Upvotes: 4

Dopele
Dopele

Reputation: 577

boolean check(Collection c1, Collection c2) {
    for(def i in c1) {
        if(c2.contains(i)) {
            return true
            break
        }
    }
    return false
}

Upvotes: 0

gkamal
gkamal

Reputation: 21000

Convert one of the list to a set and use the retainAll method to find the intersection.

def s1 = [x1,x3,x4] as Set
s1.retainAll([x2,x3,xy]).size() > 0

Upvotes: 1

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