Node.js stream.Readable.from() Method
Last Updated :
11 Oct, 2021
The stream.Readable.from() method is an inbuilt application programming interface of the Stream module which is used to construct Readable Streams out of iterators.
Syntax:
stream.Readable.from( iterable, options )
Parameters: This method accept two parameters as mentioned above and described below:
- iterable: It is an object which implements the Symbol.asyncIterator or Symbol.iterator iterable protocol.
- options: It is an options provided to the new stream.Readable([options]). By default, the Readable.from() method will set options.objectMode to true, unless its not set to false manually.
Return Value: It returns stream.Readable.
Below examples illustrate the use of stream.Readable.from() method in Node.js:
Example 1:
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 completed!!" );
|
Output:
Program completed!!
GfG
CS-Portal...
Example 2:
const { Readable } = require( 'stream' );
async function * generate() {
yield 'Nidhi' ;
yield 'GeeksforGeeks' ;
}
const readable = Readable.from(generate());
readable.on( 'data' , (chunk) => {
console.log(chunk.length);
});
console.log( "Program completed!!" );
|
Output:
Program completed!!
5
13
Reference: https://nodejs.org/api/stream.html#stream_stream_readable_from_iterable_options
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