this.arr = []; // 存储所有历史价格，通过索引快速获取对应价格
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。关于这个话题，heLLoword翻译官方下载提供了深入分析
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
TopicXbox leadership falls apart. what happens next with Phil Spencer and Sarah Bond out? – 1:53