| 1 | export default function async(arr, start, thenMethod, catchMethod, afterEach) {
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| 2 | return arr.reduce((last, next) => {
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| 3 | if(last !== start && afterEach) {
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| 4 | last = last.then(afterEach)
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| 5 | }
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| 6 |
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| 7 | if (next[thenMethod]) {
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| 8 | last = last.then(args => next[thenMethod](...[].concat(args)));
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| 9 | }
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| 10 |
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| 11 | if (next[catchMethod]) {
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| 12 | last = last.catch(next[catchMethod]);
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| 13 | }
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| 14 |
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| 15 | return last;
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| 16 | }, start);
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| 17 | }
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