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    @async-generators/map-many
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    0.1.0 • Public • Published

    map-many

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    map each item of an iterable sequence to many items

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    Usage

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

    Install

    npm install @async-generators/map-many --save
    yarn add @async-generators/map-many
    

    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

    mapMany(source, selector)

    mapMany() iterates the source and yields each item of iterable sequence returned by await selector(item, index)

    source must have a [Symbol.asyncIterator] or [Symbol.iterator] property. If both are present only [Symbol.asyncIterator] is used.

    selector(item, index) should return an iterable sequence. The second parameter is the index of the item as it appeared in the source sequence.

    Example

    example.js

    const mapMany = require('@async-generators/map-many').default;
    
    async function main() {
      async function* source() {
        yield "John";
      }
      async function* greet(name) {
        yield "Hello"; yield name; 
      }
      for await (let item of mapMany(source(), (x)=>greet(x))) {
        console.log(item);
      }
    }
    
    main();

    Execute with the latest node.js:

    node --harmony-async-iteration example.js
    

    output:

    Hello 
    John
    

    Typescript

    This library is fully typed and can be imported using:

    import filter from '@async-generators/map-many');

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

    ts-node --harmony_async_iteration foo.ts
    

    Install

    npm i @async-generators/map-many

    DownloadsWeekly Downloads

    6

    Version

    0.1.0

    License

    MIT

    Last publish

    Collaborators

    • meirionhughes