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frew@mclean.com functional3 > keepIntegers
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Filter a list to keep only Strings that are integers using Lambda and a helper function.


keepIntegers(["1"]) → ["1"]
keepIntegers(["1", "x"]) → ["1"]
keepIntegers(["a", "b"]) → []

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public List<String> keepIntegers(List<String> strings) { }

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