Created
December 14, 2018 07:10
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| class Boy { | |
| // Failable initialisation | |
| init?(age: Int) { | |
| // Age cannot be less than 0 | |
| if age < 0 { | |
| return nil | |
| } | |
| } | |
| } | |
| let boy1 = Boy(age: 10) // Boy object initialised | |
| let boy2 = Boy(age: -1) // Boy object fail to initialise, boy2 is nil |
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