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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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https://en.wikipedia.org/wiki/Metro_(design_language)
Seventy-year-old baby boomer Martha Shedden spent more than three decades building a successful career as a civil engineer. But 15 years ago, in 2011, she found a new set of numbers to obsess over: the fiercely complicated rules of the U.S. Social Security system. Today she serves as the president and cofounder of the National Association of Registered Social Security Analysts (NARSSA), the largest Social Security advisory services firm in the U.S., and she’s grappling with a problem: President Donald Trump’s handling of the nation’s finances.