In Go, understanding pass-by-reference and pass-by-value is crucial for efficient code development. While Go technically employed pass-by-value, certain situations require a deeper understanding of pointer usage.
The "*" symbol preceding a type indicates that a variable will hold an address rather than a value of that type. This concept is crucial to comprehend the proper usage of pointers. In Java, passing a Database instance occurs using a parameter like DatabaseType db, but in Go, it would appear as func PutTasks(db *sql.DB) echo.HandlerFunc.
Go's pass-by-value principle applies even when passing pointers. Thus, the function receives a copy of the pointer, not a direct reference to the object. This subtle distinction allows for pointer value overwriting without impacting the caller, unlike dereferencing and modifying the referenced memory.
Pointers are employed to share values between the function caller and its body. If changes made within the function need to be reflected in the caller's scope, pointers must be used. In the case of setter methods, pointers are the sole means to facilitate such functionality.
In Java, objects are accessed via references (pointers) automatically. However, Go provides the flexibility to access objects directly or through pointers. Passing an object directly to a function creates a copy, and modifications within the function are not visible to the caller. To ensure shared value modification, pointers should be passed instead.
Refer to the following resources for comprehensive information on pointers in Go:
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