git ssb

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module.exports = function prop (key) {
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  return key && (
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    'string' == typeof key
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    ? function (data) { return data[key] }
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    : 'object' === typeof key && 'function' === typeof key.exec //regexp
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    ? function (data) { var v = key.exec(data); return v && v[0] }
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    : key
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  )
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}
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