内容简介:This is the first part in a series about introducing the Rust language to JavaScript developers.I find it easier to understand something new if it was explained in terms of something I already know - I thought there might be others like me :)Here’s the tl;
This is the first part in a series about introducing the Rust language to JavaScript developers.
I find it easier to understand something new if it was explained in terms of something I already know - I thought there might be others like me :)
Here’s the tl;dr version:
Tool | JavaScript | Rust |
---|---|---|
Version Manager | nvm | rustup |
Package Manager | npm | Cargo |
Package Registry | npmjs.com | crates.io |
Package Manifest | package.json | Cargo.toml |
Dependency Lockfile | package-lock.json | Cargo.lock |
Task Runner | npm scripts, gulp etc | make, cargo-make |
Live Reload | nodemon | cargo-watch |
Linter | ESLint, TSLint, JSLint | Clippy |
Formatter | Prettier | rustfmt |
Dependency Vulnerability Checker | npm audit | cargo-audit |
Setup
Rust is installed using the rustup command. rustup is similar to nvm in Node.js. You can use it to install and manage multiple versions of Rust and more.
Cargo
Installing Rust using rustup also installs Cargo similar to how installing Node.js also installs NPM. Cargo is Rust’s package manager and would feel very familiar if you’ve used NPM before.
Rust’s packages are called “crates”, and they’re downloaded from the crates.io registry similar to how NPM packages are downloaded from npmjs.com .
NPM while primarily a package manager, is also used as a task runner using the npm scripts feature. Cargo has builtin support for common tasks like running code, building code etc. Cargo has features like workspaces (similar to lerna ), dependency overrides (similar to patch-package ) out of the box. It is also a test runner (similar to mocha, jest etc), benchmark runner etc.
So basically, Cargo is NPM on steroids!
Project Setup
Creating a new project is done by running
$ cargo new hello_rust
This is somewhat similar to npm init
. This creates a directory called “hello_rust” with the following files:
hello_rust ├── .git ├── .gitignore ├── Cargo.toml └─┬ src └── main.rs
Cargo.toml
This is the package manifest file similar to package.json. The lock file (package-lock.json equivalent) is named Cargo.lock. Opening the Cargo.toml, you’ll see a familiar layout:
[package] name = "hello_rust" version = "0.1.0" authors = ["sheshbabu"] edition = "2018" [dependencies]
The [package]
table
contains metadata like the crate name, author, keywords etc. The [dependencies]
table is similar to the dependencies object in package.json
. Cargo.toml also supports [dev-dependencies]
similar to devDependencies
.
Dependency Management
Installing a new dependency is done by manually editing the Cargo.toml file, adding the dependency under [dependencies]
and running cargo build
. For example, if we want to install the “serde” crate, we need to edit the Cargo.toml file as follows:
[package] name = "hello_rust" version = "0.1.0" authors = ["sheshbabu"] edition = "2018" [dependencies] + serde = "1.0.106"
and run
$ cargo build
Similarly, to remove or update a dependency, we need to manually edit the Cargo.toml file and run cargo build
. I was initially confused by the existence of the cargo install
command but it turned out to be an equivalent of npm install -g
.
If you want something similar to npm install
, npm update
or npm uninstall
, you can install cargo-edit
which enhances Cargo with cargo add
, cargo rm
and cargo upgrade
subcommands.
You can also specify the dependency version using patterns similar to NPM.
Development tools
Task Runner
Cargo supports running common tasks like build, run, test etc. But if you want something similar to NPM scripts, you can use make or cargo-make
Live Reload
Nodemon is an essential tool for Node.js development - it watches for changes to files and automatically restarts the application. cargo-watch is the equivalent in Rust world.
Linter and Formatter
Rust has builtin linter called Clippy and formatter called rustfmt . They’re equivalent to ESLint and Prettier in JS ecosystem. Precommit hooks can be managed using cargo-husky .
Vulnerability Checking
Scanning for vulnerabilities in dependencies is done using cargo-audit and is very similar to npm audit .
Thanks for reading! :)
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