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21 lines
1.3 KiB
Markdown
21 lines
1.3 KiB
Markdown
# Function Overloads
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Many Web APIs are overloaded to take different types of arguments or to skip
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arguments completely. `web-sys` contains multiple bindings for these functions
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that each specialize to a particular overload and set of argument types.
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For example, [the `fetch` API][mdn-fetch] can be given a URL string, or a
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`Request` object, and it might also optionally be given a `RequestInit` options
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object. Therefore, we end up with these `web-sys` functions that all bind to the
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`window.fetch` function:
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* [`Window::fetch_with_str`](https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.Window.html#method.fetch_with_str)
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* [`Window::fetch_with_request`](https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.Window.html#method.fetch_with_request)
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* [`Window::fetch_with_str_and_init`](https://rustwasm.github.io/wasm-bindgen/api/web_sys/str_and_inituct.Window.html#method.fetch_with_str_and_init)
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* [`Window::fetch_with_request_and_init`](https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.Window.html#method.fetch_with_request_and_init)
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Note that different overloads can use different interfaces, and therefore can
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require different sets of cargo features to be enabled.
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[mdn-fetch]: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
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