concat

concatenate several iterable sequences sequentially

Usage

package requires a system that supports async-iteration, either natively or via down-compiling

Install

npm install @async-generators/concat --save
yarn add @async-generators/concat

This package's main entry points to a commonjs distribution.

Additionally, the module entry points to a es2015 distribution, which can be used by build systems, such as webpack, to directly use es2015 modules.

Api

concat(...source)

concat() yields each sequence in the order passed to concat.

each object in ...source must be have a [Symbol.asyncIterator] or [Symbol.iterator] property.

Example

example.js

const concat = require('@async-generators/concat').default;

async function main() {
  let a = async function* () {
    yield 1; yield 2;
  }
  let b = function* () {
    yield 3;
  }
  let c = () => [ 4 ]

  for await (let item of concat(a(), b(), c())) {
    console.log(item);
  }
}
main();

Execute with the latest node.js:

node --harmony-async-iteration example.js

output:

1
2
3
4

Typescript

This library is fully typed and can be imported using:

import concat from '@async-generators/concat');

It is also possible to directly execute your properly configured typescript with ts-node:

ts-node --harmony_async_iteration example.ts