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"registry": "npmjs" }, "thunky-1.0.1.tgz": { "url": "https://registry.npmjs.org/thunky/-/thunky-1.0.1.tgz", "sha": "3db1525aac0367b67bd2e532d2773e7c40be2e68", "registry": "npmjs" }, "thunky-1.0.2.tgz": { "url": "https://registry.npmjs.org/thunky/-/thunky-1.0.2.tgz", "sha": "a862e018e3fb1ea2ec3fce5d55605cf57f247371", "registry": "npmjs" }, "thunky-1.0.3.tgz": { "url": "https://registry.npmjs.org/thunky/-/thunky-1.0.3.tgz", "sha": "f5df732453407b09191dae73e2a8cc73f381a826", "registry": "npmjs" }, "thunky-1.1.0.tgz": { "url": "https://registry.npmjs.org/thunky/-/thunky-1.1.0.tgz", "sha": "5abaf714a9405db0504732bbccd2cedd9ef9537d", "registry": "npmjs" } }, "_attachments": { "thunky-1.1.0.tgz": { "shasum": "5abaf714a9405db0504732bbccd2cedd9ef9537d" } }, "_rev": "2-9e6473c246426f3f", "_id": "thunky", "readme": "# thunky\n\nDelay the evaluation of a paramless async function and cache the result (see [thunk](http://en.wikipedia.org/wiki/Thunk_%28functional_programming%29)).\n\n```\nnpm install thunky\n```\n\n[![build status](http://img.shields.io/travis/mafintosh/thunky.svg?style=flat)](http://travis-ci.org/mafintosh/thunky)\n\n## Example\n\nLet's make a simple function that returns a random number 1 second after it is called for the first time\n\n``` js\nvar thunky = require('thunky')\n\nvar test = thunky(function (callback) { // the inner function should only accept a callback\n console.log('waiting 1s and returning random number')\n setTimeout(function () {\n callback(Math.random())\n }, 1000)\n})\n\ntest(function (num) { // inner function is called the first time we call test\n console.log(num) // prints random number\n})\n\ntest(function (num) { // subsequent calls waits for the first call to finish and return the same value\n console.log(num) // prints the same random number as above\n})\n```\n\n## Lazy evaluation\n\nThunky makes it easy to implement a lazy evaluation pattern.\n\n``` js\nvar getDb = thunky(function (callback) {\n db.open(myConnectionString, callback)\n})\n\nvar queryDb = function (query, callback) {\n getDb(function (err, db) {\n if (err) return callback(err)\n db.query(query, callback)\n })\n}\n\nqueryDb('some query', function (err, result) { ... } )\n\nqueryDb('some other query', function (err, result) { ... } )\n```\n\nThe first time `getDb` is called it will try do open a connection to the database.\nAny subsequent calls will just wait for the first call to complete and then call your callback.\n\nA nice property of this pattern is that it *easily* allows us to pass any error caused by `getDb` to the `queryDb` callback.\n\n## Error → No caching\n\nIf the thunk callback is called with an `Error` object as the first argument it will not cache the result\n\n``` js\nvar fails = thunky(function (callback) {\n console.log('returning an error')\n callback(new Error('bad stuff'))\n})\n\nfails(function (err) { // inner function is called\n console.log(err)\n});\n\nfails(function (err) { // inner function is called again as it returned an error before\n console.log(err)\n})\n```\n\n## Promise version\n\nA promise version is available as well\n\n``` js\nvar thunkyp = require('thunky/promise')\n\nvar ready = thunkyp(async function () {\n // ... do async stuff\n return 42\n})\n\n// same semantics as the callback version\nawait ready()\n```\n\n## License\n\nMIT" }