composite v0.2.3

Composite

Compose functions together

Example

var compose = require("composite"),
    composeAsync = compose.async

var composed = compose(function (b) {
    return b * 2
}, function (a) {
    return a * 3
})

composed(3) // 18

var composedAsync = composeAsync(function (err, b, cb) {
    cb(null, b * 2)
}, function (a, cb) {
    cb(null, a * 3)
})

composedAsync(3, function (err, result) {
    // error === null, result === 18
})

Example abusing this

var composed = composeAsync(parseFile, stringifyFile, fs.readFile)

composed.call({}, "foo.js", function (err, data) {
    // data = someJSONObject
})

// If you specify a this value, then that value will be used as this for
// all the functionsan empty object is given. This is useful to store state
function stringifyFile(err, data, cb) {
    if (err) {
        return cb(err)
    }

    this.data = data.toString()
    cb(null)
}

function parseFile(err, cb) {
    cb(err, this.data && JSON.parse(this.data))
}

Installation

npm install composite

Tests

make test

Contributors

• Raynos

MIT Licenced