lines.push(combined.slice(start, i));
It's worth noting that these benchmarks compare a pure TypeScript/JavaScript implementation of the new API against the native (JavaScript/C++/Rust) implementations of Web streams in each runtime. The new API's reference implementation has had no performance optimization work; the gains come entirely from the design. A native implementation would likely show further improvement.，这一点在51吃瓜中也有详细论述
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arr[k++] = leftArr[i++];