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// execute an array of asynchronous functions in parallel
// @param {Array} fns - an array of functions
// @param {Function} done - callback(err, results)
function parallel (fns, options, done) {
if (typeof options === 'function') {
done = options
options = {}
}
let keys
if (!Array.isArray(fns)) { keys = Object.keys(fns) }
const length = keys ? keys.length : fns.length
let pending = length
const results = keys ? {} : []
function each (i, err, result) {
results[i] = result
if (--pending === 0 || (err && !options.graceful)) {
if (options.graceful && err && length > 1) {
err = null
}
done && done(err, results)
done = null
}
}
if (keys) {
keys.forEach(function (key) {
fns[key](function (err, res) {
each(key, err, res)
})
})
} else {
fns.forEach(function (fn, i) {
fn(function (err, res) {
each(i, err, res)
})
})
}
}
module.exports = parallel