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representations","homepage":"https://github.com/sanctuary-js/sanctuary-show#readme","repository":{"type":"git","url":"git://github.com/sanctuary-js/sanctuary-show.git"},"bugs":{"url":"https://github.com/sanctuary-js/sanctuary-show/issues"},"license":"MIT","readme":"# sanctuary-show\n\nHaskell has a `show` function which can be applied to a compatible value to\nproduce a descriptive string representation of that value. The idea is that\nthe string representation should, if possible, be an expression which would\nproduce the original value if evaluated.\n\nThis library provides a similar [`show`](#show) function.\n\nIn general, this property should hold: `eval (show (x)) = x`. In some cases\nparens are necessary to ensure correct interpretation (`{}`, for example,\nis an empty block rather than an empty object in some contexts). Thus the\nproperty is more accurately stated `eval ('(' + show (x) + ')') = x`.\n\nOne can make values of a custom type compatible with [`show`](#show) by\ndefining a `@@show` method. For example:\n\n```javascript\n//# Maybe#@@show :: Maybe a ~> () -> String\n//.\n//. ```javascript\n//. > show (Nothing)\n//. 'Nothing'\n//.\n//. > show (Just (['foo', 'bar', 'baz']))\n//. 'Just ([\"foo\", \"bar\", \"baz\"])'\n//. ```\nMaybe.prototype['@@show'] = function() {\n return this.isNothing ? 'Nothing' : 'Just (' + show (this.value) + ')';\n};\n```\n\n### `show :: Showable a => a -⁠> String`\n\nReturns a useful string representation of the given value.\n\nDispatches to the value's `@@show` method if present.\n\nWhere practical, `show (eval ('(' + show (x) + ')')) = show (x)`.\n\n```javascript\n> show (null)\n'null'\n\n> show (undefined)\n'undefined'\n\n> show (true)\n'true'\n\n> show (new Boolean (false))\n'new Boolean (false)'\n\n> show (-0)\n'-0'\n\n> show (NaN)\n'NaN'\n\n> show (new Number (Infinity))\n'new Number (Infinity)'\n\n> show ('foo\\n\"bar\"\\nbaz\\n')\n'\"foo\\\\n\\\\\"bar\\\\\"\\\\nbaz\\\\n\"'\n\n> show (new String (''))\n'new String (\"\")'\n\n> show (['foo', 'bar', 'baz'])\n'[\"foo\", \"bar\", \"baz\"]'\n\n> show ([[[[[0]]]]])\n'[[[[[0]]]]]'\n\n> show ({x: [1, 2], y: [3, 4], z: [5, 6]})\n'{\"x\": [1, 2], \"y\": [3, 4], \"z\": [5, 6]}'\n```\n","readmeFilename":"README.md"}