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add Variable.IsUndefined()

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This commit is contained in:
Daniel Kang 2019-01-15 17:17:08 -08:00
parent 344c96d280
commit d1f7baf054
1 changed files with 7 additions and 0 deletions
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7
script/variable.go
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@ -153,3 +153,10 @@ func (v *Variable) String() string {
func (v *Variable) Object() objects.Object { func (v *Variable) Object() objects.Object {
return *v.value return *v.value
} }
// IsUndefined returns true if the underlying value is undefined.
func (v *Variable) IsUndefined() bool {
_, isUndefined := (*v.value).(objects.Undefined)
return isUndefined
}