How to add an element to an array in karate? - karate

Question

How to add an element to an array in karate?
I have a string array(not json array) from response and add a string element to it for next request.
I tried a lot with JS functions but with no luck.
Any help is appreciated.
Scenario:123
* def roles = ["role1"]
* def newrole = "role2"
* def addrolefn =
"""
function(role,roles1) {
var fullrole = [];
for (var i=0; i<roles1.length;i++) {
fullrole = fullrole.push(role);
}
return fullrole;
}
"""
* def fullroles = call addrolefn (newrole,roles)
* print fullroles

Answer 1

Please refer to the set keyword.
* def roles = ["role1"]
* def newrole = "role2"
* set roles[1] = newrole
* print karate.pretty(roles)
Result:
06:26:35.324 [main] INFO com.intuit.karate - [print] [
"role1",
"role2"
]
edit: actually I've just raised an enhancement request to add an append keyword to Karate. Meanwhile, this should answer all your questions and act as a workaround.
* def roles = null
# javascript that assigns an empty array if null
* json roles = (roles || [])
* def newrole = "role2"
# javascript to append to an array. the def void is useless
* def void = (roles.add(newrole))
* print karate.pretty(roles)
edit: type cast to json, and using java list api add method