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Go Struct Comparison: Understanding Comparable vs. Ordered

While Go structures (structs) with comparable fields are indeed comparable, the specification also makes a distinction between comparable and ordered values. Comparable values, such as structs with only comparable fields, can be compared for equality using operators like == and !=. However, ordered values, which include numeric types and types that implement the sort.Interface, have additional ordering relationships that can be expressed using operators like <, <=, >, and >=.

In the example provided, you compare two Student structs using the greater-than-or-equal (>=) operator. While the Student struct has comparable fields (string and uint8), it is not an ordered type. Therefore, the compiler raises an error, indicating that the >= operator is not defined for structs.

To use comparison operators that require ordered values, you would need to implement the sort.Interface on your Student type. By providing methods like Less, you can define the ordering relationship between Student instances, allowing you to use operators like <, <=, >, and >=.

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