Calculates a fromIndexRight of a given value for an array.
This method calculates a fromIndexRight of a given value for an array.
Kind: Exported function
Returns: number
- The calculated fromIndex. Default is 0.
Throws:
TypeError
If array is null or undefined.
Param | Type | Description |
---|---|---|
array | Array |
The array on which to calculate the starting index. |
fromIndex | number |
The position in this array at which to begin. A negative value gives the index of array.length + fromIndex by asc. |
Example
import calcFromIndexRight from 'calculate-from-index-right-x';
calcFromIndexRight([1, 2, 3], 1); // 1
calcFromIndexRight([1, 2, 3], Infinity); // 2
calcFromIndexRight([1, 2, 3], -Infinity); // -Infinity
calcFromIndexRight([1, 2, 3], -1); // 2