Add first and first_mut methods #507
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These are useful for getting an initial value when iterating over an array (e.g. when calculating the minimum element with `fold`).
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This was referenced Oct 24, 2018
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These are useful for getting an initial value when iterating over an array (e.g. when calculating the minimum element with
fold).Their signatures match the
.first()and.first_mut()methods on slices.