@stdlib/streams-node-from-constant

Create a readable stream which always streams the same value.

https://github.com/stdlib-js/streams-node-from-constant

Science Score: 44.0%

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Keywords

const constant javascript node node-js nodejs readable repeat stdlib stream streams util utilities utility utils

Last synced: 6 months ago · JSON representation ·

Repository

Create a readable stream which always streams the same value.

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Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 1.85 MB

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const constant javascript node node-js nodejs readable repeat stdlib stream streams util utilities utility utils

Created over 4 years ago · Last pushed 7 months ago

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Readme Changelog Contributing License Code of conduct Citation Security

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

Constant Stream

Create a readable stream which always streams the same value.

## Installation ```bash npm install @stdlib/streams-node-from-constant ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). - To use as a general utility for the command line, install the corresponding [CLI package][cli-section] globally. The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships. To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

## Usage ```javascript var constantStream = require( '@stdlib/streams-node-from-constant' ); ``` #### constantStream( value\[, options] ) Returns a [readable stream][readable-stream] which **always** streams the **same** `value`. ```javascript var inspectStream = require( '@stdlib/streams-node-inspect-sink' ); var iStream; var stream; function log( chunk, i ) { console.log( chunk.toString() ); if ( i === 10 ) { stream.destroy(); } } stream = constantStream( 'beep' ); iStream = inspectStream( log ); stream.pipe( iStream ); ``` The function accepts the following `options`: - **objectMode**: specifies whether a [stream][stream] should operate in [objectMode][object-mode]. Default: `false`. - **encoding**: specifies how `Buffer` objects should be decoded to `strings`. Default: `null`. - **highWaterMark**: specifies the maximum number of bytes to store in an internal buffer before pausing streaming. - **sep**: separator used to join streamed data. This option is only applicable when a stream is **not** in [objectMode][object-mode]. Default: `'\n'`. - **iter**: number of iterations. To set [stream][stream] `options`, ```javascript var opts = { 'objectMode': true, 'encoding': 'utf8', 'highWaterMark': 64 }; var stream = constantStream( 'beep', opts ); ``` By default, the function returns a [stream][stream] which streams an infinite number of values (i.e., the [stream][stream] will **never** end). To limit the number of streamed values, set the `iter` option. ```javascript var inspectStream = require( '@stdlib/streams-node-inspect-sink' ); function log( chunk ) { console.log( chunk.toString() ); } var opts = { 'iter': 10 }; var stream = constantStream( 'beep', opts ); var iStream = inspectStream( log ); stream.pipe( iStream ); ``` By default, when not operating in [objectMode][object-mode], a returned [stream][stream] delineates streamed values using a newline character. To specify an alternative separator, set the `sep` option. ```javascript var inspectStream = require( '@stdlib/streams-node-inspect-sink' ); function log( chunk ) { console.log( chunk.toString() ); } var opts = { 'iter': 10, 'sep': ',' }; var stream = constantStream( 'beep', opts ); var iStream = inspectStream( log ); stream.pipe( iStream ); ``` * * * #### constantStream.factory( \[value, ]\[options] ) Returns a `function` for creating [readable streams][readable-stream] which **always** stream the **same** provided `value`. ```javascript var opts = { 'objectMode': true, 'encoding': 'utf8', 'highWaterMark': 64 }; var createStream = constantStream.factory( opts ); ``` If provided a `value` to stream, the returned function returns [readable streams][readable-stream] which **always** stream the **same** `value`. ```javascript var createStream = constantStream.factory( 'beep' ); var stream1 = createStream(); var stream2 = createStream(); // ... ``` If not provided a `value` to stream, the returned function requires that a `value` be provided at each invocation. ```javascript var createStream = constantStream.factory(); var stream1 = createStream( 'beep' ); var stream2 = createStream( 'boop' ); // ... ``` The method accepts the same `options` as [`constantStream()`](#constant-stream). * * * #### constantStream.objectMode( value\[, options] ) This method is a convenience function to create [streams][stream] which **always** operate in [objectMode][object-mode]. ```javascript var inspectStream = require( '@stdlib/streams-node-inspect-sink' ); function log( v ) { console.log( v ); } var value = { 'beep': 'boop' }; var opts = { 'iter': 10 }; var stream = constantStream.objectMode( value, opts ); opts = { 'objectMode': true }; var iStream = inspectStream( opts, log ); stream.pipe( iStream ); ``` This method accepts the same `options` as [`constantStream()`](#constant-stream); however, the method will **always** override the [`objectMode`][object-mode] option in `options`.

## Notes - In binary mode, a provided `value` must be a `string`, `Buffer`, or `Uint8Array`. - In [`objectMode`][object-mode], `null` is a reserved value. If provided `null`, the returned [stream][stream] will prematurely end. - If provided an `object` reference, the `value` is **not** copied. To avoid unwanted mutation, copy the `value` **before** creating a [stream][stream]. - In older Node.js environments, `Uint8Array` contents may be copied to a new `Buffer` object due to changes in the underlying Node.js APIs. - If the `factory` method is provided only one argument and that argument is an `object` (either empty or not containing any recognized `options` properties), the method treats the argument as a value to be streamed, **not** as an `options` argument.

## Examples ```javascript var inspectStream = require( '@stdlib/streams-node-inspect-sink' ); var constantStream = require( '@stdlib/streams-node-from-constant' ); function log( v ) { console.log( v.toString() ); } var opts = { 'objectMode': true, 'iter': 10 }; var stream = constantStream( 3.14, opts ); opts = { 'objectMode': true }; var iStream = inspectStream( opts, log ); stream.pipe( iStream ); ```

## CLI

## Installation To use as a general utility, install the CLI package globally ```bash npm install -g @stdlib/streams-node-from-constant-cli ```

### Usage ```text Usage: constant-stream [options] Options: -h, --help Print this message. -V, --version Print the package version. --sep sep Separator used to join streamed data. Default: '\n'. -n, --iter iterations Number of iterations. ```

### Notes - In accordance with POSIX convention, a trailing newline is **always** appended to generated output prior to exit.

### Examples ```bash $ constant-stream 'beep' -n 10 ```

* * * ## Notice This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more. For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].

Owner

Name: stdlib
Login: stdlib-js
Kind: organization

Website: https://stdlib.io
Twitter: stdlibjs
Repositories: 3,692
Profile: https://github.com/stdlib-js

Standard library for JavaScript.

Citation (CITATION.cff)

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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npmjs.org: @stdlib/streams-node-from-constant

Create a readable stream which always streams the same value.

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.2.2
published over 1 year ago

Versions: 11
Dependent Packages: 4
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npmjs.org: @stdlib/streams-node-from-constant-cli

Create a readable stream which always streams the same value.

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.2.2
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@stdlib/utils-next-tick ^0.0.x
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readable-stream ^2.1.4

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@stdlib/streams-node-from-constant

Science Score: 44.0%

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Constant Stream

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