var isIndex = require('./isIndex'), isLength = require('./isLength'); /** * The base implementation of `_.at` without support for string collections * and individual key arguments. * * @private * @param {Array|Object} collection The collection to iterate over. * @param {number[]|string[]} props The property names or indexes of elements to pick. * @returns {Array} Returns the new array of picked elements. */ function baseAt(collection, props) { var index = -1, length = collection.length, isArr = isLength(length), propsLength = props.length, result = Array(propsLength); while(++index < propsLength) { var key = props[index]; if (isArr) { result[index] = isIndex(key, length) ? collection[key] : undefined; } else { result[index] = collection[key]; } } return result; } module.exports = baseAt;