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30secondsofcode
2020-04-29 06:10:15 +00:00
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@ -6139,7 +6139,7 @@
"type": "snippet",
"attributes": {
"fileName": "pipeAsyncFunctions.md",
"text": "Performs left-to-right function composition for asynchronous functions.\n\nUse `Array.prototype.reduce()` with the spread operator (`...`) to perform left-to-right function composition using `Promise.then()`.\nThe functions can return a combination of: simple values, `Promise`'s, or they can be defined as `async` ones returning through `await`.\nAll functions must be unary.\n\n",
"text": "Performs left-to-right function composition for asynchronous functions.\n\nUse `Array.prototype.reduce()` and the spread operator (`...`) to perform function composition using `Promise.then()`.\nThe functions can return a combination of normal values, `Promise`s or be `async`, returning through `await`.\nAll functions must accept a single argument.\n\n",
"codeBlocks": {
"code": "const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));",
"example": "const sum = pipeAsyncFunctions(\n x => x + 1,\n x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\n x => x + 3,\n async x => (await x) + 4\n);\n(async() => {\n console.log(await sum(5)); // 15 (after one second)\n})();"
@ -6151,10 +6151,10 @@
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