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gives the first ei for which crit[ei] is True, or Missing["NotFound"] if none is found.
gives default if there is no ei such that crit[ei] is True.
represents an operator form of SelectFirst that can be applied to an expression.
Select the first element that is even:
Use a pure function to test elements:
Give the default x when no even numbers are found:
SelectFirst operates on values in an Association:
Select FirstCase FirstPosition First
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