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21 lines
903 B
Markdown
21 lines
903 B
Markdown
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### Collections
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Rust’s standard library includes a number of very useful data
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structures called collections. Most other data types represent one
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specific value, but collections can contain multiple values. Unlike
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the built-in array and tuple types, the data these collections point
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to is stored on the heap, which means the amount of data does not need
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to be known at compile time and can grow or shrink as the program
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runs.
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This exercise will get you familiar with two fundamental data
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structures that are used very often in Rust programs:
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* A *vector* allows you to store a variable number of values next to
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each other.
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* A *hash map* allows you to associate a value with a particular key.
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You may also know this by the names *map* in C++, *dictionary* in
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Python or an *associative array* in other languages.
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[Rust book chapter](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
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