Node.js Stream readable[Symbol.asyncIterator]() Method
The readable[Symbol.asyncIterator]() method in a Readable Stream is utilized to fully consume the stream.
Syntax:
readable[Symbol.asyncIterator]()
Parameters: This method does not accept any parameters.
Return Value: It returns asyncIterator to fully consume the stream.
Below examples illustrate the use of readable[Symbol.asyncIterator]() method in Node.js:
Example 1:
const fs = require( 'fs' );
async function print(readable) {
readable.setEncoding( 'utf8' );
let data = '' ;
for await (const chunk of readable) {
data += chunk;
}
console.log(data);
}
print(fs.createReadStream( 'input.text' )). catch (console.error);
|
Output:
Promise { <Pending> }
GeeksforGeeks
Example 2:
const { Readable } = require( 'stream' );
async function * generate() {
yield 'GfG' ;
yield 'CS-Portal' ;
}
const readable = Readable.from(generate());
readable.on( 'data' , (chunk) => {
console.log(chunk);
});
console.log( "program ends!!!" );
|
Output:
program ends!!!
GfG
CS-Portal
Reference: https://nodejs.org/api/stream.html#stream_readable_symbol_asynciterator.
Last Updated :
11 Oct, 2021
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