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Perfect for optional callback parameters. Packaged as a [Node.js](https://nodejs.org/) module.\n\n## Installation\n\n```\nnpm install possible-function --save\n```\n\nThe module exposes a single factory function.\n\n## Usage\n\n`PossibleFunction` wraps a value that may or may be a function. If the underlying value is not a function, then the `PossibleFunction` wrapper will execute one of the following fallback behaviors.\n\n### Passthrough Fallback\n\nIf the wrapped value turns out to not be a function, the wrapping function will, by default, pass through whatever is given as the first argument. This is useful for optional filters.\n\n```javascript\nconst PossibleFunction = require('possible-function')\n\nfunction sayHello (name, filter) {\n  filter = PossibleFunction(filter)\n  return filter('Hello, ' + name)\n}\n\n// No filter is provided, so the hello message is returned without change:\nsayHello('world') // 'Hello, world'\n\n// A filter is provided which changes the hello message:\nsayHello('world', m =\u003e m + '!!') // 'Hello, world!!'\n```\n\n### Return-Value Fallback\n\nIf the wrapped value turns out to not be a function, the wrapping function can be configured to return a value of your choosing.\n\n```javascript\nconst PossibleFunction = require('possible-function')\n\nfunction sayHello (nameCallback) {\n  nameCallback = PossibleFunction(nameCallback, 'world')\n  return 'Hello, ' + nameCallback()\n}\n\nsayHello() // 'Hello, world'\nsayHello(() =\u003e 'Dolly') // 'Hello, Dolly'\n```\n\n### Self Fallback\n\nIf you provide the possible function as its own fallback, then you can accept either a value or a function as an argument for your code. For example, the `sayHello` function in the following example can accept either a string or a function.\n\n```javascript\nconst PossibleFunction = require('possible-function')\n\nfunction sayHello (nameCallback) {\n  nameCallback = PossibleFunction(nameCallback, nameCallback)\n  return 'Hello, ' + nameCallback()\n}\n\nsayHello('world') // 'Hello, world'\nsayHello(() =\u003e 'world') // 'Hello, world'\n```\n\n### Custom Fallback\n\nIf the wrapped value turns out to not be a function, the wrapping function can execute a custom fallback function instead:\n\n```javascript\nconst PossibleFunction = require('possible-function')\nconst mightBeAFunction = null\nconst callback = PossibleFunction(mightBeAFunction, (...args) =\u003e args.length)\ncallback('arg 1', 'arg 2') // 2\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flamansky%2Fpossible-function","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Flamansky%2Fpossible-function","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flamansky%2Fpossible-function/lists"}