transformer

Transform data using synchronous and asynchronous functions.

:cloud: Installation

# Using npm
npm install --save transformer

# Using yarn
yarn add transformer

:clipboard: Example

const Transformer = require("transformer");

let t = new Transformer({ world: "Earth" });


// There are three levels where the functions are added to be executed:
//
// Parallel:               | <0: [.............................................]>
// Unordered (don't wait): |                                <4a: [........]>
//                         +                                <4b: [....]>
//                         +                                <4c: [......]>
// Ordered (wait):         | <1: [...]> <2: [.]> <3:[.....]>                <5: [....]>

// This will run in parallel with all the other functions
t.add((data, cb) => {
    setTimeout(() => {
        data.parallel = 42;
        cb();
    }, 2000);
}, Transformer.PARALLEL);

// Async function, but ordered
t.add((data, cb) => {
    setTimeout(() => {
        data.oldWorld = data.world;
        data.world = "Mars";
        cb();
    }, 1000);
});

// Another async function and ordered
t.add((data, cb) => {
    setTimeout(() => {
        data.baz = 7;
        cb();
    }, 500);
});

// Async function, but not ordered
t.add((data, cb) => {
    setTimeout(() => {
        data.foo = 42;
        cb();
    }, 1000);
}, Transformer.UNORDERED);

// Another unordered function (this will end sooner)
t.add((data, cb) => {
    setTimeout(() => {
        data.bar = 42;
        cb(null, data);
    }, 900);
}, Transformer.UNORDERED);

// Sync function
t.add(data => {
    data.planet = data.world;
});

// Finally show the data
t.on("end", (err, data) => console.log(data));
// => { world: 'Mars'
//    , parallel: 42
//    , oldWorld: 'Earth'
//    , baz: 7
//    , bar: 42
//    , foo: 42
//    , planet: 'Mars' }

:question: Get Help

There are few ways to get help:

1. Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
2. For bug reports and feature requests, open issues. :bug:
3. For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation

transformer(data, opts)

Transformer Transforms the data using synchronous and asynchronous functions.

Params

• Object data: The data object.
• Object opts: The options object:
• autostart (Boolean): If true, the functions will be executed, without calling the start() method.

Return

• Number Return description.

add(fn, type)

Adds a new function.

There are three levels where the functions are added to be executed:

Parallel: | <0: [.............................................]> Unordered (don't wait): | <4a: [........]> + <4b: [....]> + <4c: [......]> Ordered (wait): | <1: [...]> <2: [.]> <3:[.....]> <5: [....]>

Params

• Function|Transformer fn: The function to add. Note you can add an existing transformer instance as well.
• TransformerType type: One of the following:
  • Transformer.PARALLEL: Used to append on the parallel timeline.
  • Transformer.UNORDERED: Grouped, but unordered.
  • Transformer.ORDERED: Grouped, but ordered.

Return

• Transformer The current Transformer instance.

start(data, fn)

Starts the function execution.

Params

• Object data: The data object.
• Function fn: The callback function.

:yum: How to contribute

Have an idea? Found a bug? See how to contribute.

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:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

• lien
• launchjs

:scroll: License

MIT © Ionică Bizău