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Divide an array into equal halves
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| # @return [Array] Two-member Array containing self evenly split into two sub-arrays | |
| # @example | |
| # [1,2,3,4].halves #=> [[1,2],[3,4]] | |
| # [1,2,3].halves #=> [[1,2],[3]] | |
| def halves | |
| [self[0..(self.size/2.0).round-1], self[(self.size/2.0).round..self.size]] | |
| end |
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