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Use an application of a closure to clarify evaluation order. #13

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8 changes: 5 additions & 3 deletions proposal.md
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Expand Up @@ -118,7 +118,9 @@ ifNullExpression:
logicalOrExpression ‘??’ logicalOrExpression
```

An if-null expression of the form *e1??e2* is equivalent to the expression *e1 == null? e2: e1*.
An if-null expression of the form *e1??e2* is equivalent to the expression
`((x) => x == null ? e2 : x)(e1)`
where *x* is a variable that is not used in *e2*.

#### 16.31 Assignable Expressions

Expand All @@ -141,8 +143,8 @@ assignableSelector:
```
An assignable expression can be conditional or unconditional.

A conditional assignable expression of the form *e1?.identifier* is equivalent to the expression
`e1 == ` **null** `? ` **null** ` : e1.identifier`.
A conditional assignable expression of the form *e?.identifier* is equivalent to the expression
`((x) => x == null ? null : x.identifier)(e)`.

An unconditional assignable expression is either:

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