May 2018
Beginner to intermediate
290 pages
6h 43m
English
Content preview from Getting Clojure
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Sets
Along with maps, Clojure also sports a built-in set data type. The literal syntax for a set borrows the braces from maps but adds a # to the front:
| | (def genres #{:sci-fi :romance :mystery}) |
| | |
| | (def authors #{"Dickens" "Austen" "King"}) |
Like their mathematical namesakes, Clojure sets are all about membership: a value either is or is not a member of a set. Since a value can only be in a set once, if you repeat a value in a set literal, you’ll get an error. Thus, this:
| | #{"Dickens" "Austen" "Dickens"} |
is one "Dickens" too many:
| | IllegalArgumentException Duplicate key: Dickens... |
Like maps, sets have their own ideas about the order of their elements. The set that you wrote as #{:sci-fi :romance :mystery} is liable to come ...
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