You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33 lines
963 B
JavaScript
33 lines
963 B
JavaScript
var isArrayLike = require('./isArrayLike'),
|
|
isIndex = require('./isIndex');
|
|
|
|
/**
|
|
* 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,
|
|
isNil = collection == null,
|
|
isArr = !isNil && isArrayLike(collection),
|
|
length = isArr ? collection.length : 0,
|
|
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] = isNil ? undefined : collection[key];
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
module.exports = baseAt;
|