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Once the\nfunction is called for the first time the return value of the original\nfunction is saved in `fn.value` and subsequent calls will continue to\nreturn this value.\n\n```javascript\nvar once = require('once')\n\nfunction load (cb) {\n cb = once(cb)\n var stream = createStream()\n stream.once('data', cb)\n stream.once('end', function () {\n if (!cb.called) cb(new Error('not found'))\n })\n}\n```\n\n## `once.strict(func)`\n\nThrow an error if the function is called twice.\n\nSome functions are expected to be called only once. Using `once` for them would\npotentially hide logical errors.\n\nIn the example below, the `greet` function has to call the callback only once:\n\n```javascript\nfunction greet (name, cb) {\n // return is missing from the if statement\n // when no name is passed, the callback is called twice\n if (!name) cb('Hello anonymous')\n cb('Hello ' + name)\n}\n\nfunction log (msg) {\n console.log(msg)\n}\n\n// this will print 'Hello anonymous' but the logical error will be missed\ngreet(null, once(msg))\n\n// once.strict will print 'Hello anonymous' and throw an error when the callback will be called the second time\ngreet(null, once.strict(msg))\n```\n","maintainers":[{"name":"isaacs","email":"i@izs.me"}],"time":{"modified":"2018-03-11T12:37:07.947Z","created":"2012-08-14T07:25:56.929Z","1.1.1":"2012-08-14T07:25:58.262Z","1.2.0":"2013-08-12T02:55:21.962Z","1.3.0":"2013-10-24T06:27:26.638Z","1.3.1":"2014-09-18T23:05:04.887Z","1.3.2":"2015-05-04T23:09:54.026Z","1.3.3":"2015-11-20T21:45:14.765Z","1.4.0":"2016-09-06T21:11:09.367Z"},"author":{"name":"Isaac Z. 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