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rust for vs for_each
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This is equivalent to using a for loop on the iterator,
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although break and continue are not possible from a closure.
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It's generally more idiomatic to use a for loop,
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but for_each may be more legible when processing
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items at the end of longer iterator chains.
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In some cases for_each may also be faster than a loop,
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because it will use internal iteration on adaptors like Chain.
