# ee.Array.bitCount

On an element-wise basis, calculates the number of one-bits in the 64-bit two's complement binary representation of the input.

<br />

| Usage | Returns |
|---|---|
| `Array.bitCount()` | Array |

| Argument | Type | Details |
|---|---|---|
| this: `input` | Array | The input array. |

## Examples

### Code Editor (JavaScript)

```javascript
print(ee.Array([], ee.PixelType.int8()).bitCount());  // []

print(ee.Array([0]).bitCount());        // [0]
print(ee.Array([1]).bitCount());        // [1]
print(ee.Array([2]).bitCount());        // [1]
print(ee.Array([3]).bitCount());        // [2]
print(ee.Array([0xFFFF]).bitCount());   // [16]
print(ee.Array([1, 2, 3]).bitCount());  // [1,1,2]

print(ee.Array([[0, 1], [6, 13]]).bitCount());  // [[0,1],[2,3]]

// https://en.wikipedia.org/wiki/Two's_complement signed values.
print(ee.Array([-1]).bitCount());                       // [64]
print(ee.Array([-1], ee.PixelType.int8()).bitCount());  // [64]
print(ee.Array([-2]).bitCount());                       // [63]
```
Python setup

See the [Python Environment](https://developers.google.com/earth-engine/guides/python_install) page for information on the Python API and using
`geemap` for interactive development.

```python
import ee
import geemap.core as geemap
```

### Colab (Python)

```python
display(ee.Array([], ee.PixelType.int8()).bitCount())  # []

display(ee.Array([0]).bitCount())        # [0]
display(ee.Array([1]).bitCount())        # [1]
display(ee.Array([2]).bitCount())        # [1]
display(ee.Array([3]).bitCount())        # [2]
display(ee.Array([0xFFFF]).bitCount())   # [16]
display(ee.Array([1, 2, 3]).bitCount())  # [1, 1, 2]

display(ee.Array([[0, 1], [6, 13]]).bitCount())  # [[0, 1], [2, 3]]

# https://en.wikipedia.org/wiki/Two's_complement signed values.
display(ee.Array([-1]).bitCount())                       # [64]
display(ee.Array([-1], ee.PixelType.int8()).bitCount())  # [64]
display(ee.Array([-2]).bitCount())                       # [63]
```