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'use strict';
const values = require('../helpers/values');
const { isFunction } = require('../helpers/is');
module.exports = function sum(key) {
const items = values(this.items);
let total = 0;
if (key === undefined) {
for (let i = 0, { length } = items; i < length; i += 1) {
total += parseFloat(items[i]);
}
} else if (isFunction(key)) {
for (let i = 0, { length } = items; i < length; i += 1) {
total += parseFloat(key(items[i]));
}
} else {
for (let i = 0, { length } = items; i < length; i += 1) {
total += parseFloat(items[i][key]);
}
}
return parseFloat(total.toPrecision(12));
};