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docs(banner): correct grammar
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### Instructions
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"`Result` is a better version of the `Option` type that describes possible `error` instead of possible `absence`".
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"`Result` is a better version of the `Option` type that describes a possible `error` instead of possible `absence`".
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Create a structure called `Flag` which has the following elements:
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- short_hand: `String`
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- long_hand: `String`
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- desc: `String`
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- `short_hand`: `String`
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- `long_hand`: `String`
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- `desc`: `String`
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This structure must have a **function** called `opt_flag` which initializes the structure.
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This **function** receives two strings references and returns a structure `Flag`. Here is an example of its usage:
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This **function** receives two string references and returns a structure `Flag`. Here is an example of its usage:
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```rust
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let d = Flag::opt_flag("diff", "gives the difference between two numbers");
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@ -20,24 +20,17 @@ This **function** receives two strings references and returns a structure `Flag`
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// output: "short hand: -d, long hand: --diff, description: gives the difference between two numbers"
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```
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A second structure called `FlagsHandler` will be given which just has one element: `flags: HashMap<(String, String), Callback>`
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The following **functions** (methods) associated with `FlagsHandler` are for you to complete :
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A second structure named `FlagsHandler` will be given which just has one element: `flags: HashMap<(String, String), Callback>`. You'll need to implement the following **associated functions**" (methods) associated with `FlagsHandler` are for you to complete:"
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- `add_flag`, which adds to the HashMap the flag and the Callback function.
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- `exec_func`, which executes the function using the flag provided and returns the result, which can be either a string with the value from the callback or an error.
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- `add_flag`, which adds the flag and callback function to the HashMap.
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- `exec_func`, which executes the function using the flag provided and returns the result. The result will be either a string with the value from the callback or an error.
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A `type` called `Callback` will also be provided. It is a function which is going to be used in the structure
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and functions above. This function will be the callback for the flag associated to it.
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A `type` called `Callback` will also be provided. It is a function which is going to be used in the structure and functions above. This function will be the callback for the flag associated to it.
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You will have to create the following callback functions :
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You will have to create the following callback functions:
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- `div` which converts the reference strings to `float`s and returns the `Result`, being the division of the `float`s or the standard (std) error: `ParseFloatError`.
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- `rem` which converts the reference strings to `float`s and returns the `Result`, being the remainder of the division of the `float`s or the standard (std) error `ParseFloatError`.
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### Notions
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- [Result](https://doc.rust-lang.org/rust-by-example/error/result.html)
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- [Method optflag](https://docs.rs/getopts/0.2.18/getopts/struct.Options.html#method.optflag)
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- `div`: which converts the reference strings to `float`s and returns the `Result`, as the division of the `float`s or the standard (std) error: `ParseFloatError`.
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- `rem`: which converts the reference strings to `float`s and returns the `Result`, as the remainder of the division of the `float`s or the standard (std) error `ParseFloatError`.
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### Expected Function
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@ -118,3 +111,8 @@ $ cargo run
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"invalid float literal"
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$
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```
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### Notions
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- [Result](https://doc.rust-lang.org/rust-by-example/error/result.html)
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- [Method optflag](https://docs.rs/getopts/0.2.18/getopts/struct.Options.html#method.optflag)
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