made with requirebin
Created
December 15, 2017 10:31
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requirebin sketch
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| // Welcome! require() some modules from npm (like you were using browserify) | |
| // and then hit Run Code to run your code on the right side. | |
| // Modules get downloaded from browserify-cdn and bundled in your browser. | |
| const delay = (t) => new Promise((resolve, reject) => { | |
| setTimeout(() => resolve(delay.DELAY), t) | |
| }) | |
| delay.DELAY = Symbol('DELAY') | |
| const timeout = (t) => (p) => Promise.race([p, delay(t)]).then( | |
| (value) => { | |
| console.log('timeout?', value === delay.DELAY) | |
| if (value === delay.DELAY) { | |
| throw 'Operation timed out' | |
| } | |
| return value | |
| } | |
| ) | |
| const retry = (n) => (f) => new Promise((resolve, reject) => { | |
| const attempt = (n) => { | |
| if (n > 0) { | |
| f().then(resolve).catch(() => attempt(n - 1)) | |
| } else { | |
| return reject(retry.FAILED) | |
| } | |
| } | |
| attempt(n + 1) | |
| }) | |
| retry.FAILED = Symbol('RETRY_FAILED') | |
| const getStuff = (...$) => delay(100).then(() => [...$]) | |
| getStuff(1, 2, 3) | |
| .then((x) => console.log('success 1', x)) | |
| .catch((x) => console.error('Failure 1', x)); | |
| ( | |
| (...$) => timeout(20)(getStuff(...$)) | |
| )(1, 2, 3) | |
| .catch((x) => console.error('Failure', x)); | |
| ( | |
| (...$) => retry(2)(() => getStuff(...$)) | |
| )(1, 2, 3) | |
| .then((x) => console.error('Success 2', x)) | |
| .catch((x) => console.error('Failure 2', x)); | |
| ( | |
| (...$) => retry(2)(() => timeout(20)(getStuff(...$))) | |
| )(1, 2, 3) | |
| .then((x) => console.error('Success 3', x)) | |
| .catch((x) => console.error('Failure 3', x)); | |
| // (...(() => P) => () => P) => (() => P) => () => P | |
| const compose = (...promiseFns) => promiseFns.reduce((acc, promiseFn) => (f) => acc(promiseFn(f))) | |
| const retryTwiceWithTimeout = compose( | |
| (f) => () => retry(2)(f), | |
| (f) => () => timeout(20)(f()) | |
| ) | |
| const getStuffSafe = (...$) => retryTwiceWithTimeout(() => getStuff(...$))() | |
| getStuffSafe(1, 2, 3) | |
| .then((x) => console.log('success compose', x)) | |
| .catch((x) => console.error('Failure compose', x)) | |
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| setTimeout(function(){ | |
| ;// Welcome! require() some modules from npm (like you were using browserify) | |
| // and then hit Run Code to run your code on the right side. | |
| // Modules get downloaded from browserify-cdn and bundled in your browser. | |
| const delay = (t) => new Promise((resolve, reject) => { | |
| setTimeout(() => resolve(delay.DELAY), t) | |
| }) | |
| delay.DELAY = Symbol('DELAY') | |
| const timeout = (t) => (p) => Promise.race([p, delay(t)]).then( | |
| (value) => { | |
| console.log('timeout?', value === delay.DELAY) | |
| if (value === delay.DELAY) { | |
| throw 'Operation timed out' | |
| } | |
| return value | |
| } | |
| ) | |
| const retry = (n) => (f) => new Promise((resolve, reject) => { | |
| const attempt = (n) => { | |
| if (n > 0) { | |
| f().then(resolve).catch(() => attempt(n - 1)) | |
| } else { | |
| return reject(retry.FAILED) | |
| } | |
| } | |
| attempt(n + 1) | |
| }) | |
| retry.FAILED = Symbol('RETRY_FAILED') | |
| const getStuff = (...$) => delay(100).then(() => [...$]) | |
| getStuff(1, 2, 3) | |
| .then((x) => console.log('success 1', x)) | |
| .catch((x) => console.error('Failure 1', x)); | |
| ( | |
| (...$) => timeout(20)(getStuff(...$)) | |
| )(1, 2, 3) | |
| .catch((x) => console.error('Failure', x)); | |
| ( | |
| (...$) => retry(2)(() => getStuff(...$)) | |
| )(1, 2, 3) | |
| .then((x) => console.error('Success 2', x)) | |
| .catch((x) => console.error('Failure 2', x)); | |
| ( | |
| (...$) => retry(2)(() => timeout(20)(getStuff(...$))) | |
| )(1, 2, 3) | |
| .then((x) => console.error('Success 3', x)) | |
| .catch((x) => console.error('Failure 3', x)); | |
| // (...(() => P) => () => P) => (() => P) => () => P | |
| const compose = (...promiseFns) => promiseFns.reduce((acc, promiseFn) => (f) => acc(promiseFn(f))) | |
| const retryTwiceWithTimeout = compose( | |
| (f) => () => retry(2)(f), | |
| (f) => () => timeout(20)(f()) | |
| ) | |
| const getStuffSafe = (...$) => retryTwiceWithTimeout(() => getStuff(...$))() | |
| getStuffSafe(1, 2, 3) | |
| .then((x) => console.log('success compose', x)) | |
| .catch((x) => console.error('Failure compose', x)) | |
| ;}, 0) |
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| { | |
| "name": "requirebin-sketch", | |
| "version": "1.0.0" | |
| } |
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| <!-- contents of this file will be placed inside the <body> --> |
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| <!-- contents of this file will be placed inside the <head> --> |
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