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28 lines
638 B
28 lines
638 B
'use strict';
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var values = require('../helpers/values');
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var _require = require('../helpers/is'),
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isFunction = _require.isFunction;
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module.exports = function sum(key) {
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var items = values(this.items);
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var total = 0;
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if (key === undefined) {
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for (var i = 0, length = items.length; i < length; i += 1) {
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total += items[i];
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}
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} else if (isFunction(key)) {
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for (var _i = 0, _length = items.length; _i < _length; _i += 1) {
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total += key(items[_i]);
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}
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} else {
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for (var _i2 = 0, _length2 = items.length; _i2 < _length2; _i2 += 1) {
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total += items[_i2][key];
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}
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}
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return total;
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};
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