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21 lines
660 B
21 lines
660 B
13 years ago
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module.exports = chain
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var bindActor = require("./bind-actor.js")
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chain.first = {} ; chain.last = {}
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function chain (things, cb) {
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var res = []
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;(function LOOP (i, len) {
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if (i >= len) return cb(null,res)
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if (Array.isArray(things[i]))
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things[i] = bindActor.apply(null,
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things[i].map(function(i){
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return (i===chain.first) ? res[0]
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: (i===chain.last)
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? res[res.length - 1] : i }))
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if (!things[i]) return LOOP(i + 1, len)
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things[i](function (er, data) {
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if (er) return cb(er, res)
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if (data !== undefined) res = res.concat(data)
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LOOP(i + 1, len)
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})
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})(0, things.length) }
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