On May 10, 2012, at 22:13 , Brendan Eich wrote:
> What are iterFunc and iterGen?
I fixed the code, see below.
> The * means to exhaust the yield operand's value, otherwise you're just
> yielding that value. PEP-380 is the basis:
>
> "The following new expression syntax will be allowed in the body of a
> generator:
>
> yield from<expr>
>
> where <expr> is an expression evaluating to an iterable, from which an
> iterator is extracted. The iterator is run to exhaustion, during which time
> it yields and receives values directly to or from the caller of the generator
> containing the yield from expression (the "delegating generator")."
>
>
> There's no point requiring an iterator not an iterable given the special
> form. Are you actually concerned about the * being too little syntax for the
> special form's semantics?
I just like the idea of seeing where recursion recursion happens and that
generator recursion looks similar to function recursion. More a coding style
thing than about ES.next syntax or semantics.
>> function visit(visitor) {
>> if (this.left) {
>> visit(this.left, visitor);
>> }
>> visitor(this.label);
>> if (this.right) {
>> visit(this.right, visitor);
>> }
>> }
>>
>> function* iter() {
>> if (this.left) {
>> yield* iter(this.left);
>> }
>> yield this.label;
>> if (this.right) {
>> yield* iter(this.right);
>> }
>> }
>>
>> Tree.prototype.visit = visit;
>> Tree.prototype[iterator] = iter;
>
--
Dr. Axel Rauschmayer
[email protected]
home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com
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