git ssb

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exports.first = function first(plug) {
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  return function () {
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    var args = [].slice.call(arguments)
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    for(var i = 0; i < plug.length; i++) {
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      var val = plug[i].apply(null, args)
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      if(val) return val
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    }
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  }
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}
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exports.map = function (plug) {
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  return function () {
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    var args = [].slice.call(arguments)
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    return plug.map(function (fn) {
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      if(fn) return fn.apply(null, args)
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    }).filter(Boolean)
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  }
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}
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exports.asyncConcat = function (plug) {
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  return function () {
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    var args = [].slice.call(arguments)
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    var cb = args.pop()
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    var allResults = []
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    var waiting = plug.length
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    plug.forEach(function (fn) {
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      if (!fn) return next()
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      fn.apply(null, args.concat(next))
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    })
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    function next(err, results) {
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      if (err) {
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        waiting = 0
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        return cb(err)
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      }
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      if (results) allResults = allResults.concat(results)
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      if (--waiting === 0) cb(null, allResults)
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    }
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  }
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}
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