obj

flyd-obj

Functions for working with Flyd stream in objects.

• Convert object values from plain values into streams with streamProps
• Convert object values from streams into plain values with extractProps
• Convert a plain object with stream values into a single stream of plain objects with stream

These functions perform these conversions recursively in nested objects.

streamProps(obj)

Given an object of normal values, turn every value into a stream. It will stream nested properties recursively.

Signature

Object a -> Object (Stream a)

Usage

const flydObj = require('flyd/module/object')
const obj = {x: 1, y: {z: 2}}
const objOfStreams = flydObj.streamProps(obj)

objOfStreams.x() // 1
objOfStreams.y.z() // 2

extractProps(obj)

Given an object that contains streams for values, extract everything into an object of regular values. It will extract nested properties recursively.

Signature

Object (Stream a) -> Object a

Usage

const objOfStreams = {x: flyd.stream(1), y: {z: flyd.stream(2)}}
const obj = flydObj.extractProps(objOfStreams)
//obj is {x: 1, y: {z: 2}}

stream(obj)

Given an object containing streams, combine all the streams into a single stream of plain objects.

Signature

Object (Stream a) -> Stream (Object a)

Usage

const click = flyd.stream()
const message = flyd.map(() => 'Hello world!', state.click)
const state = {click, message}

const stateStream = flydObj.stream(state)

stateStream() // {click: undefined, message: undefined}

click(true)
stateStream() // {click: true, message: 'Hello World!'}