How to Check for Equality of Three Values in Go Elegantly?

How to Determine the Equality of Three Values with Elegance

In Go, it is not immediately clear how to efficiently determine the equality of three values, a, b, and c. While the expression if a == b == c appears intuitive, it results in a compile error.

Traditional Approach

A straightforward approach is to use logical AND (&&) to check each pair of values: if a == b && a == c {...}. However, this can become cumbersome and confusing as the number of values increases.

Creative Solutions

Beyond the traditional approach, Go's versatility allows for a variety of creative solutions:

• Maps as Sets: Utilize a map to store the values as keys. If all values are equal, the map will contain only one key-value pair.
• Arrays: Arrays are comparable, so [2]interface{}{a, b} == [2]interface{}{b, c} evaluates to true if a == b and b == c.
• Tricks with Maps: A map can be used to store the result of b == c and check the associated value for b. If a == b, the result will indicate equality.
• Anonymous Structs: Structs are comparable, allowing for expressions like struct{ a, b interface{} }{a, b} == struct{ a, b interface{} }{b, c}.
• Reflect.DeepEqual: For slices, which are not directly comparable, the reflect.DeepEqual() function can be used.
• Helper Function: A helper function, such as AllEquals(), can be created to encapsulate the comparison of multiple values.

Note on Efficiency

While some of these creative solutions may be intriguing, it is important to note that the clear and concise if a == b && a == c {...} approach remains the most efficient and straightforward option for checking the equality of three values.

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