| 1 | /**
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| 2 | * The base implementation of `_.sum` and `_.sumBy` without support for
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| 3 | * iteratee shorthands.
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| 4 | *
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| 5 | * @private
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| 6 | * @param {Array} array The array to iterate over.
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| 7 | * @param {Function} iteratee The function invoked per iteration.
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| 8 | * @returns {number} Returns the sum.
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| 9 | */
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| 10 | function baseSum(array, iteratee) {
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| 11 | var result,
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| 12 | index = -1,
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| 13 | length = array.length;
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| 14 |
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| 15 | while (++index < length) {
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| 16 | var current = iteratee(array[index]);
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| 17 | if (current !== undefined) {
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| 18 | result = result === undefined ? current : (result + current);
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| 19 | }
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| 20 | }
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| 21 | return result;
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| 22 | }
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| 23 |
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| 24 | module.exports = baseSum;
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