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