[rustc.git] / src / tools / clippy / src / docs / if_then_some_else_none.txt

### What it does
Checks for if-else that could be written using either `bool::then` or `bool::then_some`.

### Why is this bad?
Looks a little redundant. Using `bool::then` is more concise and incurs no loss of clarity.
For simple calculations and known values, use `bool::then_some`, which is eagerly evaluated
in comparison to `bool::then`.

### Example
```
let a = if v.is_empty() {
    println!("true!");
    Some(42)
} else {
    None
};
```

Could be written:

```
let a = v.is_empty().then(|| {
    println!("true!");
    42
});
```
Commit	Line	Data
f2b60f7d FG	1	### What it does
	2	Checks for if-else that could be written using either `bool::then` or `bool::then_some`.
	3
	4	### Why is this bad?
	5	Looks a little redundant. Using `bool::then` is more concise and incurs no loss of clarity.
	6	For simple calculations and known values, use `bool::then_some`, which is eagerly evaluated
	7	in comparison to `bool::then`.
	8
	9	### Example
	10	```
	11	let a = if v.is_empty() {
	12	println!("true!");
	13	Some(42)
	14	} else {
	15	None
	16	};
	17	```
	18
	19	Could be written:
	20
	21	```
	22	let a = v.is_empty().then(\|\| {
	23	println!("true!");
	24	42
	25	});
	26	```