README
¶
Optional
Optional is a simple package which provides Optional[T] type and helper functions for sql.Null* types.
Usage example
val := None[int]()
val = Of(2)
slc, err := val.MarshalJSON()
fmt.Println(string(slc), err)
ptr := val.Ptr()
fmt.Println(*ptr)
// Output:
// 2 <nil>
// 2
Inspiration
Documentation
¶
Overview ¶
Example ¶
val := None[int]() val = Of(2) slc, err := val.MarshalJSON() fmt.Println(string(slc), err) ptr := val.Ptr() fmt.Println(*ptr)
Output: 2 <nil> 2
Index ¶
Examples ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Optional ¶
type Optional[T any] struct { // contains filtered or unexported fields }
Optional represents a type T that may be "null" - that, which value is missing.
func (Optional[T]) Get ¶
Get returns a value, true on non-empty optional and zero-value and false otherwise.
func (Optional[T]) MarshalJSON ¶
MarshalJSON implements json.Marshaler.
func (Optional[T]) Ptr ¶
func (o Optional[T]) Ptr() *T
Ptr returns a pointer to value or nil pointer. It is safe to change the value inside the pointer (if the T type supports this).
func (*Optional[T]) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler
func (Optional[T]) ValueOr ¶
func (o Optional[T]) ValueOr(val T) T
ValueOr returns a value on non-empty optional or provided value otherwise.
func (Optional[T]) ValueOrZero ¶
func (o Optional[T]) ValueOrZero() T
ValueOrZero returns a value on non-empty optional and zero-value otherwise.
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