evalmd/dist/promise-ripple.js

Evaluates javascript code blocks from markdown files.

var _ = require('lodash');
var Promise = require('bluebird');
function promiseRipple(start, props) {
    props = (props) ? props : start;
    start = (props) ? start : {};
    props = _.mapValues(props, function (prop, key) {
        prop.key = key;
        return prop;
    });
    return Promise.reduce(_.values(props), function (result, action) {
        if (typeof action !== 'function')
            throw new Error('property values must be functions');
        return Promise.resolve(action(start)).then(function (value) {
            if (start === value) {
                return value;
            }
            else {
                start[action.key] = value;
                return value;
            }
        });
    }, null)
        .then(function () {
        return start;
    });
}
module.exports = promiseRipple;
// promiseRipple({zero: 'zero'}, {
//   'alpha': function (data) {
//     return Promise.resolve(data.zero + ' alpha') // async -> 'zero alpha'
//   },
//   'beta': function (data) {
//     data.foo = 'foo'
//     data.bar = 'bar'
//     return data
//   },
//   'gamma': function (data) {
//     return Promise.resolve(data.zero + ' gamma') // async -> 'zero gamma'
//   },
//   'delta': function (data) {
//     return Promise.resolve(data.zero + data.alpha + ' delta') // async -> 'zerozero alpha delta'
//   },
// }).then(function (results) {
//   console.log(results)
// })