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?. && ?[ as member access with nullPropagation. If the object is undefined this will return undefined. If the object on which you want to access the property is defined, the value of the propery will be given back.

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Kristof Degrave
2017-02-11 16:44:28 +01:00
parent c79dd953ea
commit b902fe6c7b
6 changed files with 612 additions and 2 deletions
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ast/spec.md
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@@ -857,10 +857,11 @@ interface MemberExpression <: Expression, Pattern {
object: Expression | Super;
property: Expression;
computed: boolean;
nullPropagation: boolean;
}
```
A member expression. If `computed` is `true`, the node corresponds to a computed (`a[b]`) member expression and `property` is an `Expression`. If `computed` is `false`, the node corresponds to a static (`a.b`) member expression and `property` is an `Identifier`.
A member expression. If `computed` is `true`, the node corresponds to a computed (`a[b]`) member expression and `property` is an `Expression`. If `computed` is `false`, the node corresponds to a static (`a.b`) member expression and `property` is an `Identifier`. The `nullPropagation` flags indecates that the member expression can be called even if the object is null or undefined. If this is the object value (null/undefined) should be returned.
### BindExpression