| export default function extent(values, valueof) { |
| let min; |
| let max; |
| if (valueof === undefined) { |
| for (const value of values) { |
| if (value != null) { |
| if (min === undefined) { |
| if (value >= value) min = max = value; |
| } else { |
| if (min > value) min = value; |
| if (max < value) max = value; |
| } |
| } |
| } |
| } else { |
| let index = -1; |
| for (let value of values) { |
| if ((value = valueof(value, ++index, values)) != null) { |
| if (min === undefined) { |
| if (value >= value) min = max = value; |
| } else { |
| if (min > value) min = value; |
| if (max < value) max = value; |
| } |
| } |
| } |
| } |
| return [min, max]; |
| } |
|
|
