reflect

Documentation

Index

• func IsNil(i interface{}) bool

Functions

func IsNil

func IsNil(i interface{}) bool

IsNil returns true if the parameter is:

• untyped nil (<nil, nil>)
• a nil value with some fixed type, e.g., (<io.Reader, nil>)

It differs from '== nil' in that a pointer to some type will still be considered nil if it is being passed to an interface.

Because this uses reflection it is much slower than a direct comparison to nil but is generally <100 microseconds per check. In a tight loop with a potentially very large number of iterations this may be a consideration.