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assert-args [![Build Status](https://travis-ci.org/tjmehta/assert-args.svg)](https://travis-ci.org/tjmehta/assert-args) [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)\nValidate and format function arguments ( handles types and optionals).\n\n## Installation\n```bash\nnpm install --save assert-args\n```\n\n## Examples\n### assertArgs(arguments, validator)\nAssert argument types and format arguments into an object\n```js\nfunction something (foo, bar, baz, qux, corge) {\n  var args = assertArgs(arguments, {\n    'foo': 'object',            // foo is required and must be a object\n    '[bar]': SomeClass,         // bar is optional and must be an instance of 'SomeClass'\n    'baz'  : someTest           // baz must pass someTest (someTest should throw an error if it fails)\n    'qux': ['string', 'number'] // qux is required and must be a string or number\n    '...corge': 'function'     // corge is required and captures multiple arguments that must be functions\n\n  })\n  foo = args.foo\n  bar = args.bar\n  baz = args.baz\n  qux = args.qux\n  corge = args.corge // will be an array\n  /// ...\n}\n```\nCheck out the examples below.\n\n#### Type validations\n* Supports '*', 'string', 'number', 'object', 'function', and classes (Array, RegExp, etc)\n```js\n// Type example\nvar args = assertArgs(arguments, {\n  'foo': 'string' // required string _or_ number arguments\n})\n/*\nWill throw an error if it does not pass:\n  TypeError: \"foo\" must be a string\n*/\n// Multi-type example\nvar args = assertArgs(arguments, {\n  'foo': ['string', 'number'] // requires string or number argument\n})\n/*\nWill throw an error if it does not pass:\n  TypeError: \"foo\" must be a string or number\n*/\n\n// Class example\nvar args = assertArgs(arguments, {\n  'foo': Array // required Array argument\n})\n/*\nWill throw an error if it does not pass:\n  TypeError: \"foo\" must be an instance of Array\n*/\n\n```\n\n#### Custom validations\n```js\nvar args = assertArgs(arguments, {\n  'foo': customValidation\n})\n// custom validation should throw an error if the value is invalid\nfunction customValidation (value) {\n  if (!value.bar) {\n    throw new Error('\"bar\" is required')\n  }\n}\n/*\nIf `foo` does not pass it will throw:\n  Error: \"foo\" is invalid: \"bar\" is required\n*/\n```\n\n#### Required arguments\n```js\nvar args = assertArgs(arguments, {\n  'foo': 'string' // required string argument\n})\n```\n\n#### Optional arguments\n```js\nvar args = assertArgs(arguments, {\n  '[foo]': 'string' // optional string argument\n})\n```\n\n#### Spread arguments\n```js\nvar args = assertArgs(arguments, {\n  '...foo': 'string', // captures multiple arguments\n  'cb': 'function'\n})\n```\n\n### Full examples\n```js\nvar args = assertArgs(['str', {}, function () {}], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nargs = {\n  foo: 'str',\n  bar: {},\n  qux: function () {}\n}\n*/\n\nvar args = assertArgs(['str', function () {}], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nargs = {\n  foo: 'str',\n  bar: undefined,\n  qux: function () {}\n}\n*/\n\nvar args = assertArgs([], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nTypeError: \"foo\" is required\n*/\n\nvar args = assertArgs(['str'], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nTypeError: \"qux\" is required\n*/\n\nvar args = assertArgs([10, {}], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nTypeError: \"foo\" must be a string\n*/\n\nvar args = assertArgs(['str', 10], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nTypeError: \"qux\" must be a function\n*/\n\nvar args = assertArgs(['str', {}], {\n  'foo': 'string',\n  '[bar]': 'object',\n  'qux': 'function'\n})\n/*\nTypeError: \"qux\" is required\n*/\n\nvar args = assertArgs(['one', 'two', 'three', function () {}], {\n  '...foo': 'string',\n  'bar': 'function'\n})\n/*\nargs = {\n  foo: ['one', 'two', 'three'],\n  bar: function () {}\n}\n*/\n\nvar args = assertArgs([function () {}], {\n  '...foo': 'string',\n  'bar': 'function'\n})\n/*\nTypeError: \"...foo\" is required\n*/\n\nvar args = assertArgs([null, function () {}], {\n  '...foo': 'string',\n  'bar': 'function'\n})\n/*\nTypeError: \"...foo\" must be strings\n*/\n\n// Check out the tests for more examples...\n```\n\n## License\nMIT\n","_attachments":{},"homepage":"https://github.com/tjmehta/assert-args","bugs":{"url":"https://github.com/tjmehta/assert-args/issues"},"license":"MIT"}