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.
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Biggest disappointment Seeing the second GB skeleton relay team, Freya Tarbit and Marcus Wyatt, take fourth place. The sense of almost getting that medal, the sadness was so visible. I was so impressed by their performance, I wanted to hug them both.