Am Samstag, 30. März 2013 13:55:10 UTC+1 schrieb kyogron:
>
> I am currently studying the stream api.
> In the below example from the api docs "unshift" is used to reparse chunk
> which belongs to the body and not the header.
>
On Saturday, March 30, 2013 8:53:13 AM UTC-6, kyogron wrote:
>
> Ah now I understand it.
>
> this.unshift really only puts the chunk in front of the buffer which than
> will get emitted.
> If there will come some more body chunk than it will pushed as normal.
>
> I just do not get the use case actually.
> I mean in the given case it would actually not matter if we use unshift or
> push because it will be the first item in the buffer array anyway.
>
> Is this correct that this is a bad example or have I missed something?
>
>
I think you're right; in this case this.unshift is only called when nothing
has ever been pushed so it will be the first item in the array.
It may be more instructive to replace:
// now, because we got some extra data, unshift the rest
// back into the read queue so that our consumer will see it.
var b = chunk.slice(split);
this.unshift(b);
with:
// now, because we got some extra data, unshift the rest
// back into the source so that we will see it.
var b = chunk.slice(split);
this._source.unshift(b);
// try again; next time we'll take the this._inBody
// path and see the b which was just unshifted.
this.push('');
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