# Function bin Format a number as binary. ## Syntax ```js math.bin(value) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `value` | number | Value to be stringified `wordSize` | number | Optional word size (see `format`) ### Returns Type | Description ---- | ----------- string | The formatted value ### Throws Type | Description ---- | ----------- ## Examples ```js //the following outputs "0b10" math.bin(2) ``` ## See also [oct](oct.md), [hex](hex.md)