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34 lines
963 B
Markdown
34 lines
963 B
Markdown
# Packages
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a bundle of one or more crates that provides a set functionality
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it contains a cargo.toml file and describes how to build those crates
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packages can have as many binary crates as you want but only at most one library crate
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packages must have at least one crate
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packages are defined by the toml file that comes with creating a new crate
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# External Packages
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These crates are normally found on [crates.io](https://crates.io/)
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in the guessing game the external crate was first defined in the cargo.toml as
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```toml
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rand = "0.8.5"
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```
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it was then brough into scope by
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```rust
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use rand::Rng;
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// and then used
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rand::thread_rng().gen_range(0..=100);
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```
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pulling other modules is often the same process
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the std library is an external package but it doesn't need to be specified in the toml file
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but it does need to be brought into scope with the ``use`` keyword
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the std::other_part is an absolute path starting with std for the standard library crate |