| var restParam = require('../function/restParam'), |
| unzipWith = require('./unzipWith'); |
| |
| /** |
| * This method is like `_.zip` except that it accepts an iteratee to specify |
| * how grouped values should be combined. The `iteratee` is bound to `thisArg` |
| * and invoked with four arguments: (accumulator, value, index, group). |
| * |
| * @static |
| * @memberOf _ |
| * @category Array |
| * @param {...Array} [arrays] The arrays to process. |
| * @param {Function} [iteratee] The function to combine grouped values. |
| * @param {*} [thisArg] The `this` binding of `iteratee`. |
| * @returns {Array} Returns the new array of grouped elements. |
| * @example |
| * |
| * _.zipWith([1, 2], [10, 20], [100, 200], _.add); |
| * // => [111, 222] |
| */ |
| var zipWith = restParam(function(arrays) { |
| var length = arrays.length, |
| iteratee = length > 2 ? arrays[length - 2] : undefined, |
| thisArg = length > 1 ? arrays[length - 1] : undefined; |
| |
| if (length > 2 && typeof iteratee == 'function') { |
| length -= 2; |
| } else { |
| iteratee = (length > 1 && typeof thisArg == 'function') ? (--length, thisArg) : undefined; |
| thisArg = undefined; |
| } |
| arrays.length = length; |
| return unzipWith(arrays, iteratee, thisArg); |
| }); |
| |
| module.exports = zipWith; |