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deep copy prototype
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| Prototypical description of a deep copy method | |
| deepCopy:: a -> b | |
| copyDate:: Date -> Date | |
| a == Number ? s = a: | |
| a == String ? b = a: | |
| a == Boolean ? b = a: | |
| a == Function ? b = a: // remains by reference | |
| a == Date ? b = copyDate a: | |
| a == Object ? b = deepCopy a.keys[]: | |
| a == Array ? (a:as) => b = deepCopy a, deepCopy as | |
| - circular references |
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