19 lines
362 B
JavaScript
19 lines
362 B
JavaScript
export default function sum(values, valueof) {
|
|
let sum = 0;
|
|
if (valueof === undefined) {
|
|
for (let value of values) {
|
|
if (value = +value) {
|
|
sum += value;
|
|
}
|
|
}
|
|
} else {
|
|
let index = -1;
|
|
for (let value of values) {
|
|
if (value = +valueof(value, ++index, values)) {
|
|
sum += value;
|
|
}
|
|
}
|
|
}
|
|
return sum;
|
|
}
|