Why doesn't a pointer change another pointer in golang?

Question

go

func (t *Tree) Delete(value int) bool {

  if t.Search(value) {
    currentNode := t.root

    for currentNode != nil {
      if value == currentNode.value {
        if currentNode.left == nil && currentNode.right == nil {
          currentNode = nil
          return true
        }
      } else if value < currentNode.value {
        currentNode = currentNode.left
      } else {
        currentNode = currentNode.right
      }
    }
  }

  return false
}

There is such a function for deleting an element in a binary tree (it is unfinished and deletes an element only if the element being deleted has no descendants). Consider the case when we have only root in the tree: In the currentNode function, in this case, it will point to root, but when currentNode = nil is assigned, root does not change. Why is this happening?

Answer 1

currentNode is a variable that exists only in this function. It's a pointer, you assign a value to it, and then you assign nil to it. From this, the previously assigned object will not change, because you are only changing the pointer to this object.