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docs: cleanup the explanation paragraphs at the start of each exercise.

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Robert Fry
2023-05-29 18:39:08 +01:00
parent 30291a3c25
commit 7eef5d15ee
95 changed files with 577 additions and 337 deletions
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30
exercises/error_handling/errors2.rs
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@@ -1,21 +1,23 @@
// errors2.rs
//
// Say we're writing a game where you can buy items with tokens. All items cost
// 5 tokens, and whenever you purchase items there is a processing fee of 1
// token. A player of the game will type in how many items they want to buy,
// and the `total_cost` function will calculate the total cost of the tokens.
// Since the player typed in the quantity, though, we get it as a string-- and
// they might have typed anything, not just numbers!
// token. A player of the game will type in how many items they want to buy, and
// the `total_cost` function will calculate the total cost of the tokens. Since
// the player typed in the quantity, though, we get it as a string-- and they
// might have typed anything, not just numbers!
//
// Right now, this function isn't handling the error case at all (and isn't
// handling the success case properly either). What we want to do is:
// if we call the `parse` function on a string that is not a number, that
// function will return a `ParseIntError`, and in that case, we want to
// immediately return that error from our function and not try to multiply
// and add.
// There are at least two ways to implement this that are both correct-- but
// one is a lot shorter!
// Execute `rustlings hint errors2` or use the `hint` watch subcommand for a hint.
// handling the success case properly either). What we want to do is: if we call
// the `parse` function on a string that is not a number, that function will
// return a `ParseIntError`, and in that case, we want to immediately return
// that error from our function and not try to multiply and add.
//
// There are at least two ways to implement this that are both correct-- but one
// is a lot shorter!
//
// Execute `rustlings hint errors2` or use the `hint` watch subcommand for a
// hint.
// I AM NOT DONE