empty

README

Determine whether a library is empty or not. Built-in types are handles as follow. Use the Empty interface to extend functionality.

A value is empty if:

• 0 for integers of any type (e.g. int, int8...etc)
• 0.0 for floats of any type (e.g. float32, float 64)
• maps without any keys
• arrays with length of zero where each element satisfies its type specific empty criteria

Documentation

Index

• func IsEmpty(any interface{}) bool
• func IsPresent(any interface{}) bool
• func RegisterHandler(valType reflect.Type, f func(interface{}) bool)
• func TimeIsEmpty(any interface{}) bool
• type Value

Functions

func IsEmpty

func IsEmpty(any interface{}) bool

IsEmpty returns true is the value is empty, false otherwise.

func IsPresent

func IsPresent(any interface{}) bool

IsPresent returns true if the value is not empty, false otherwise.

func RegisterHandler

func RegisterHandler(valType reflect.Type, f func(interface{}) bool)

RegisterHandler registers a particular type to a function that determines whether a value of that type is empty. Useful for types that are in other libraries. However please consider using the EmptyValue interface wherever possible.

func TimeIsEmpty

func TimeIsEmpty(any interface{}) bool

TimeIsEmpty determines whether time.Time object is empty

Types

type Value

type Value interface {
	Empty() bool
}

Value is a piece of data that can either be present or not. Typically abstracts the concept of a null or empty string.