find the sum of all nodes in a linked list in swift

To find the sum of all nodes in a linked list, you need to traverse through the linked list and add up the values of each node. Here's the algorithm in Swift:

main.swift
func sumOfNodes(in list: LinkedList<Int>) -> Int {
    var sum = 0
    var currentNode = list.head
    
    while currentNode != nil {
        sum += currentNode!.value
        currentNode = currentNode!.next
    }
    
    return sum
}
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In this code, we start by initializing sum to 0 and currentNode to the head of the linked list. Then, we enter a loop that iterates until currentNode is nil, which means we've reached the end of the linked list. Inside the loop, we add the value of the current node to sum and update currentNode to be the next node in the linked list. Finally, we return the sum of all node values.

Note that this code assumes that you have already implemented a LinkedList data structure with a head property and a Node class or struct with value and next properties.