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Supports nesting, loose key matching, and more.\n\n## Installation\n\nRequires [Node.js](https://nodejs.org/) 8.3.0 or above.\n\n```bash\nnpm i khas\n```\n\n## API\n\nThe module exports a function (`has()`) that has other functions attached to it as methods (e.g. `has.any()`).\n\n### `has()`\n\n#### Parameters\n\n1. Bindable: `collection` (Array, iterator, Map, Object, Set, string, Typed Array, or WeakMap): The key-value collection from which to retrieve a value.\n2. `keychain` (any, or array of any): A key to check, or an array of nested keys.\n3. Optional: Object argument:\n    * `arrays` / `maps` / `sets` / `weakMaps` (arrays of classes/strings): Arrays of classes and/or string names of classes that should be treated as equivalent to `Array`/`Map`/`Set`/`WeakMap` (respectively).\n    * `get` (function): A callback which, if provided, will override the built-in code that fetches an individual key from a collection. Use this if you need to support collections whose custom APIs preclude the use of parameters like `maps`. The callback will be called with five arguments: the collection, the key, the options object, the fallback to return if the key is not found, and a callback for the built-in get behavior (to which your custom `get` callback can defer if it determines that it doesn’t need to override the default behavior after all).\n    * `inObj` (boolean): Whether or not to search inherited properties if `collection` is an Object (i.e. not another recognized type). Defaults to `false`.\n    * `loose` (boolean): Whether or not to evaluate keys loosely (as defined by `looselyEquals`). Defaults to `false`.\n    * `looselyEquals` (function): A callback that accepts two values and returns `true` if they are to be considered equivalent or `false` otherwise. This argument is only used if `loose` is `true`. If omitted, the default behavior will, among other things, consider arrays/objects to be equal if they have the same entries.\n\n#### Return Value\n\nReturns `true` if a value exists at the location indicated by `keychain`, otherwise `false`.\n\n#### Example\n\n```javascript\nconst has = require('khas')\n\nconst map = new Map()\nmap.set('mapKey', {objKey: 'string'})\n\nhas(map, ['mapKey', 'objKey']) // true\n```\n\n### `has.any()`\n\nHas the same signature as the main function, except that the second parameter is called `keychains` and expects an array of keys or keychain arrays. Returns `true` if at least one of them points to a value, otherwise `false`.\n\n#### Example\n\n```javascript\nconst has = require('khas')\n\nhas.any({c: 3, d: 4}, [['a', 'subkey'], 'b', 'c']) // true\n```\n\nThe function tries the keys `a.subkey`, `b`, and `c` in that order. Since there is a value located at `c`, the function returns `true`.\n\n### `has.in()`\n\nThis method is an alias for calling the main `has()` method with the `inObj` option set to `true`.\n\n### `has.any.in()`\n\nThis method is an alias for calling `has.any()` with the `inObj` option set to `true`.\n\n## Related\n\nThe “k” family of modules works on keyed/indexed collections.\n\n* [kget](https://github.com/lamansky/kget)\n* [kedit](https://github.com/lamansky/kedit)\n* [kset](https://github.com/lamansky/kset)\n* [kinc](https://github.com/lamansky/kinc)\n* [kdel](https://github.com/lamansky/kdel)\n\nThe “v” family of modules works on any collection of values.\n\n* [vhas](https://github.com/lamansky/vhas)\n* [vget](https://github.com/lamansky/vget)\n* [vsize](https://github.com/lamansky/vsize)\n* [vadd](https://github.com/lamansky/vadd)\n* [vdel](https://github.com/lamansky/vdel)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flamansky%2Fkhas","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Flamansky%2Fkhas","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flamansky%2Fkhas/lists"}