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July 31, 2017 23:06
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Simple Utility to resolve an array of promises in series.
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| function promiseReducer(arrayOfPromiseHolders, resolve, reject) { | |
| if (arrayOfPromiseHolders.length > 0) { | |
| const promiseHolder = arrayOfPromiseHolders.shift(); | |
| promiseHolder().then(() => { | |
| promiseReducer(arrayOfPromiseHolders, resolve, reject); | |
| }).catch((err) => { | |
| reject(err); | |
| }); | |
| } else { | |
| resolve(); | |
| } | |
| } | |
| /** | |
| * Resolve in series takes an array of functions that return a promise, and then | |
| * resolves them in series | |
| * | |
| * Usage: | |
| * resolveInSeries([ | |
| * () => { | |
| * return new Promise((resolve) => { console.log("I will print first!"); resolve(); }) | |
| * }, | |
| * () => { | |
| * return new Promise((resolve) => { console.log("I will print second!"); resolve(); }) | |
| * } | |
| * ]).then(() => { | |
| * console.log("I will print at the end"); | |
| * }); | |
| */ | |
| function resolveInSeries(arrayOfPromiseHolders) { | |
| return new Promise((resolve, reject) => { | |
| promiseReducer(arrayOfPromiseHolders, resolve, reject); | |
| }); | |
| } | |
| export resolveInSeries; |
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