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What is the guard keyword for?
Author: Jorge GomesStatus: PublishedQuestion passed 405 times
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1
Is the following code valid?
```
var x = 10
var y = x
```1
Swift: What is the output of the following code? `var x = 10; x = x + undefined; print(x)`2
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The mechanism that allows a class to subscribe to automatic notifications of value changes of an attribute of another class.1
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Use dispatch_once from Grand Central Dispatch,Declare the portion of code whose result is stored in a static let in Swift.