| export default function mean(values, valueof) { | |
| let count = 0; | |
| let sum = 0; | |
| if (valueof === undefined) { | |
| for (let value of values) { | |
| if (value != null && (value = +value) >= value) { | |
| ++count, sum += value; | |
| } | |
| } | |
| } else { | |
| let index = -1; | |
| for (let value of values) { | |
| if ((value = valueof(value, ++index, values)) != null && (value = +value) >= value) { | |
| ++count, sum += value; | |
| } | |
| } | |
| } | |
| if (count) return sum / count; | |
| } | |