* 获取数字的第digit位（从右往左，0表示个位）
The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
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So that’s all pretty simple. How do we draw our snakes?
The website offers a tooltip helper tool that allows