How Can We Accurately Determine Binary Tree Equivalence in Go?

Binary Trees Equivalence in Go Tour Exercise #7

Binary Trees in Go

The Same function in Go Tour's Binary Trees exercise compares whether two binary trees have the same values. The challenge lies in determining when both trees are fully traversed to declare them equivalent.

Solution

The original implementation attempts to use a channel to compare values. However, it faces the issue of determining when the channels are empty.

An alternative approach employs a higher-order function and closures to gracefully signal end-of-tree conditions. The enhanced Walk function leverages a closure to initialize a walk function. The closure ensures that the channel is closed upon function return, preventing premature channel closure due to recursion.

Here's the corrected Walk function:

func Walk(t *tree.Tree, ch chan int) {
    defer close(ch) // Closes the channel when the function returns
    var walk func(t *tree.Tree)
    walk = func(t *tree.Tree) {
        if t == nil {
            return
        }
        walk(t.Left)
        ch <- t.Value
        walk(t.Right)
    }
    walk(t)
}

This revised approach ensures that the channel is closed only after all values have been sent, allowing Same to accurately compare the trees for equivalence.

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