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#odersky-programming-in-scala-1ed #scala

Question

Although mutable sets offer an actual += method, immutable sets do not. In this case, jetSet += "Lear", is essentially [...]

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a shorthand for jetSet = jetSet + "Lear"

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Next Steps in Scala
r differs. Whereas a mutable set will add the element to itself, an immutable set will create and return a new set with the element added. In Listing 3.5, you're working with an immutable set, thus the + invocation will yield a brand new set. <span>Although mutable sets offer an actual += method, immutable sets do not. In this case, the second line of code, "jetSet += "Lear"", is essentially a shorthand for: jetSet = jetSet + "Lear" Thus, in the second line of Listing 3.5, you reassign the jetSet var with a new set containing "Boeing", "Airbus", and "Lear". Finally, the last line of Lis

Summary

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

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No repetitions

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