Go structs, methods, pointer receivers, interfaces, embedding, type assertions and generics.
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- What is a struct in Go?
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A composite data type that groups variables of different types together- What syntax defines a struct in Go?
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type StructName struct { field Type; field2 Type2 }- How do you create a struct instance with values?
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Use struct literal: StructName{field: value, field2: value2}- What is a method in Go?
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A function with a receiver argument between func keyword and method name- What is a receiver in Go?
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The argument that appears between func and the method name, binding the method to a type- Can methods be defined on non-struct types in Go?
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Yes, on any named type, but not on pointers or interface types- What is a pointer receiver?
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A receiver that is a pointer to a type, written as *Type between func and method name- When should you use a pointer receiver instead of a value receiver?
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When the method needs to modify the receiver, or when the receiver is large and copying is expensive- What is the key difference between value and pointer receivers?
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Value receiver gets a copy of the value; pointer receiver works with the original- Can you define both value and pointer receivers on the same type?
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Yes, Go allows both value and pointer receivers on the same type- What is an interface in Go?
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A type that specifies a set of method signatures without implementation- What syntax defines an interface in Go?
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type InterfaceName interface { Method1() ReturnType; Method2() ReturnType }- How does Go implement interfaces?
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Implicitly: a type automatically implements an interface if it has all required methods- What is the empty interface in Go?
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interface{}, which has no methods and can hold a value of any type- What is a type assertion in Go?
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The syntax value.(Type) that extracts a concrete value from an interface
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