func (a Args) First() interface{} {
	if len(a) > 0 {
		return a[0]
	}
	return nil
}
// First returns first element.
First returns first element.
// First returns first element .
func (a Args) First() interface{} {
	if len(a) > 0 {
		return a[0]
	}
	return nil
}
func ( a Args ) First ( ) interface { } { if len ( a ) > 0 { return a [ 0 ] } return nil }
First returns first element.
First returns first element .