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# map_or_else()
Instead of:
```rust
expr().map_or_else(
|| const_expr(),
func,
);
```
use this:
```rust
if let Some(tmp) = expr() {
tmp.func()
} else {
const_expr()
}
```
# ok_or_else()
Instead of:
```rust
let response = expr().ok_or_else(|| {
error_expr()
})?;
```
use this:
```rust
let Some(response) = expr() else {
return Err(error_expr());
};
```
# then()
Instead of:
```rust
expr().then(|| then_expr())
```
use this:
```rust
if expr() {
Some(then_expr())
} else {
None
}
```