p-reduce

WebJar for p-reduce

License	MIT
GroupId	org.webjars.npm
ArtifactId	p-reduce
Last Version	1.0.0
Release Date	Mar 25, 2019
Type	jar
Description	p-reduce WebJar for p-reduce
Project URL	http://webjars.org
Source Code Management	https://github.com/sindresorhus/p-reduce

Download p-reduce

Filename	Size
p-reduce-1.0.0.pom
p-reduce-1.0.0.jar	5 KB
p-reduce-1.0.0-sources.jar	22 bytes
p-reduce-1.0.0-javadoc.jar	22 bytes

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/org.webjars.npm/p-reduce/ -->
<dependency>
    <groupId>org.webjars.npm</groupId>
    <artifactId>p-reduce</artifactId>
    <version>1.0.0</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/org.webjars.npm/p-reduce/
implementation 'org.webjars.npm:p-reduce:1.0.0'

Gradle Kotlin

// https://jarcasting.com/artifacts/org.webjars.npm/p-reduce/
implementation ("org.webjars.npm:p-reduce:1.0.0")

Apache Buildr

'org.webjars.npm:p-reduce:jar:1.0.0'

Apache Ivy

<dependency org="org.webjars.npm" name="p-reduce" rev="1.0.0">
  <artifact name="p-reduce" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='org.webjars.npm', module='p-reduce', version='1.0.0')
)

Scala SBT

libraryDependencies += "org.webjars.npm" % "p-reduce" % "1.0.0"

Leiningen

[org.webjars.npm/p-reduce "1.0.0"]

Dependencies

There are no dependencies for this project. It is a standalone project that does not depend on any other jars.

Project Modules

There are no modules declared in this project.

p-reduce

Reduce a list of values using promises into a promise for a value

Useful when you need to calculate some accumulated value based on async resources.

Install

$ npm install p-reduce

Usage

const pReduce = require('p-reduce');
const humanInfo = require('human-info'); // Not a real module

(async () => {
	const names = [
		getUser('sindresorhus').then(info => info.name),
		'Addy Osmani',
		'Pascal Hartig',
		'Stephen Sawchuk'
	];

	const totalAge = await pReduce(names, async (total, name) => {
		const info = await humanInfo(name);
		return total + info.age;
	}, 0);

	console.log(totalAge);
	//=> 125
})();

API

pReduce(input, reducer, initialValue?)

Returns a Promise that is fulfilled when all promises in input and ones returned from reducer are fulfilled, or rejects if any of the promises reject. The fulfilled value is the result of the reduction.

input

Type: Iterable<Promise|any>

Iterated over serially in the reducer function.

reducer(previousValue, currentValue, index)

Type: Function

Expected to return a value. If a Promise is returned, it's awaited before continuing with the next iteration.

initialValue

Type: unknown

Value to use as previousValue in the first reducer invocation.

Related

• p-each-series - Iterate over promises serially
• p-map-series - Map over promises serially
• p-map - Map over promises concurrently
• More…

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Versions

Version
1.0.0 Mar 25, 2019