20版 - 新书架

· · 来源:dev资讯

In JavaScript, the natural primitive for "a sequence of things that arrive over time" is already in the language: the async iterable. You consume it with for await...of. You stop consuming by stopping iteration.

Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.

04版91视频对此有专业解读

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