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reduce+generator
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| function reduce(f, acc, iter) { | |
| if (arguments.length == 2) { | |
| iter = acc[Symbol.iterator](); | |
| acc = iter.next().value; | |
| } | |
| for (const a of iter) acc = f(acc, a); | |
| return acc; | |
| } | |
| reduce((a, b) => a + b, function*() { | |
| yield 1; | |
| yield 2; | |
| yield 3; | |
| } ()); | |
| // 6 |
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