Getting Clojure

One Thing After Another

The vector is one of Clojure’s most widely used—and useful—data structures. It’s just an ordered collection of items. Here, for example, is a vector of four numbers:

vector/examples.clj

[1 2 3 4]

Syntactically, our little four-element vector could not be simpler: it’s just four values surrounded by a pair of square brackets, sans commas. While our first vector contained only numbers, there is no requirement that all the items in a vector be of the same type. You can, for example, mix in strings:

[1 "two" 3 "four"]

Or Booleans:

[true 3 "four" 5]

You can even nest vectors within vectors:

[1 [true 3 "four" 5] 6]

And then do it again:

[0 [1 [true 3 "four" 5] 6] 7]

You can, in fact, embed any Clojure value ...