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# onetime [](https://travis-ci.org/sindresorhus/onetime) > Only call a function once When called multiple times it will return the return value from the first call. *Unlike the module [once](https://github.com/isaacs/once), this one isn't naughty extending `Function.prototype`.* ## Install ``` $ npm install --save onetime ``` ## Usage ```js let i = 0; const foo = onetime(() => i++); foo(); //=> 0 foo(); //=> 0 foo(); //=> 0 ``` ## API ### onetime(function, [shouldThrow]) #### function Type: `function` Function that should only be called once. #### shouldThrow Type: `boolean` Default: `false`  Set to `true` if you want it to fail with a nice and descriptive error when called more than once. ## License MIT © [Sindre Sorhus](http://sindresorhus.com)