---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: valid.jsonc
---
# Input
```cjs
[0, [12], [[16]]].map(Number).flat(2);
```

# Input
```cjs
array.flat().map(Number);
```

# Input
```cjs
array.map(Number).flat(customFn);
```

# Input
```cjs
MyObject.map(one, two, tree).flat();
```

# Input
```cjs
MyObject.map().flat(1, 'test')
```