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iOS Swift 2.0 Collections and Control Flow Control Flow With Loops Working with Loops

can some one explain to me this challenge it "I am lost"!!!!!! please thank you!!

i do not understand it!!!!!! explain to me as i was a 4 year old.!!

while.swift
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below

1 Answer

while counter < numbers.count {
    sum += numbers[counter]
    counter++
}