git ssb

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var computed = require('./computed')
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module.exports = Keys
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function Keys (collection) {
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  var result = []
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  var initialized = false
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  return computed(collection, function (value) {
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    var keys = Object.keys(value)
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    var changed = false
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    for (var i = 0; i < keys.length; i++) {
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      if (result[i] !== keys[i]) {
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        result[i] = keys[i]
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        changed = true
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      }
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    }
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    if (result.length !== keys.length) {
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      changed = true
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      result.length = keys.length
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    }
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    if (changed || !initialized) {
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      initialized = true
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      return result
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    } else {
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      return computed.NO_CHANGE
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    }
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  })
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}
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