throught2 : what did I do wrong

[Roelof Wobben]

Hello,

I try to make a function which uppercase a stream by using through2.

So I did this :

~~~

var through = require('through2');

var tr = through(function (chunk, enc,callback) {
    chunk. toString().toUpperCase();
    this.push(chunk);
    callback();
});

process.stdin.pipe(tr).pipe(process.stdout);

~~~

But the output is not uppercased . Where did I do things wrong ?

Roelof

[Aria Stewart]

> On 18 Jan 2015, at 04:53, Roelof Wobben <rwo...@hotmail.com> wrote:
>
> Hello,
>
> I try to make a function which uppercase a stream by using through2.
>
> So I did this :
>
> ~~~
>
> var through = require('through2');
> var tr = through(function (chunk, enc,callback) {
> chunk. toString().toUpperCase();
> this.push(chunk);

try this.push(chunk.toString().toUpperCase());

String methods in javascript return new strings, rather than modifying the string.

> callback();
> });
>
> process.stdin.pipe(tr).pipe(process.stdout);
>
> ~~~
>
> But the output is not uppercased . Where did I do things wrong ?
>
> Roelof
>
>

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[Roelof Wobben]

Thanks, another point learned.

Roelof

Op zondag 18 januari 2015 16:17:39 UTC+1 schreef Aria Stewart:

[Shripad K]

    chunk. toString().toUpperCase(); 

Strings are immutable.