Unable to Parse the variable value to the array variable - karate

Question

I was trying to pass the variable 'i' value to a array index 'locations[i]' using below karate code. but throwing an error saying unable to parse. Please suggest be for any changes.
Feature: Verify Branches
Background: For loop implementation
Given url ''
When method GET
Then status 200
* def i = 0
* def z = $.locations[i].zip
* def p = $.locations[i].phone
* def fun =
"""
function(locations){
for (var i = 0; i < locations.length; i++)
{
print(i)
print('Element at Location ' + i +':' + p)
}
}
"""
Scenario: Validate the locations
Given url ''
When method GET
Then status 200
* call fun p

Answer 1

It is hard to make out anything since you have not provided the value of the response. There are many things wrong here. But I'll try.
Take this line:
* def z = $.locations[i].zip
This will not work, Karate does not support variables within JsonPath by default, refer the docs: https://github.com/intuit/karate#jsonpath-filters
And I think you are un-necessarily using JsonPath where normal JavaScript would have been sufficient:
* def z = response.locations[i].zip
Also it seems you are just trying to loop over an array and call a feature. Please refer to the documentation on Data Driven Features.
Take some time and read the docs and examples please, it will be worth your time. One more tip - before I leave you to understand Karate a little better. There is a way to convert a JSON array into another JSON array should you need it:
* def fun = function(x){ return { value: x } }
* def list = [1, 2, 3]
* def res = karate.map(list, fun)
* match res == [{ value: 1 }, { value: 2 }, { value: 3 }]
So there should never be a need for you to manually do a for loop at all.