Node.js Stream & Buffers

Streams 

sart using data, before it has finished loading. 

- ex) Before all the data could be stored >> we can pass it as a stream (Buffer)

- ex) Send down it every time it fills.

 

 

const readStream = fs.createReadStream('../docs/blog3.txt', {encoding: 'utf8'});
const writeStream = fs.createWriteStream('../docs/blog4.txt');

readStream.on('data', (chunk) =>{ //chunk: chunk of data.
    //on is event listener.
    //fire the call back data
    console.log('----new Chunk ----');
    console.log(chunk);
    writeStream('\n NewChunk \n'); //pass data through a stream. 
    writeStream.write(chunk);
})

 

Easier Way

//shorter way: Piping
const writeStream = fs.createWriteStream('../docs/blog4.txt');
readStream.pipe(writeStream);

 

from 2 of Node.js Crash Course Tutorial