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.
47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
9 years ago
|
var baseSlice = require('../internal/baseSlice'),
|
||
|
|
isIterateeCall = require('../internal/isIterateeCall');
|
||
|
|
|
||
|
|
/* Native method references for those with the same name as other `lodash` methods. */
|
||
|
|
var nativeCeil = Math.ceil,
|
||
|
|
nativeFloor = Math.floor,
|
||
|
|
nativeMax = Math.max;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates an array of elements split into groups the length of `size`.
|
||
|
|
* If `collection` can't be split evenly, the final chunk will be the remaining
|
||
|
|
* elements.
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @category Array
|
||
|
|
* @param {Array} array The array to process.
|
||
|
|
* @param {number} [size=1] The length of each chunk.
|
||
|
|
* @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
|
||
|
|
* @returns {Array} Returns the new array containing chunks.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* _.chunk(['a', 'b', 'c', 'd'], 2);
|
||
|
|
* // => [['a', 'b'], ['c', 'd']]
|
||
|
|
*
|
||
|
|
* _.chunk(['a', 'b', 'c', 'd'], 3);
|
||
|
|
* // => [['a', 'b', 'c'], ['d']]
|
||
|
|
*/
|
||
|
|
function chunk(array, size, guard) {
|
||
|
|
if (guard ? isIterateeCall(array, size, guard) : size == null) {
|
||
|
|
size = 1;
|
||
|
|
} else {
|
||
|
|
size = nativeMax(nativeFloor(size) || 1, 1);
|
||
|
|
}
|
||
|
|
var index = 0,
|
||
|
|
length = array ? array.length : 0,
|
||
|
|
resIndex = -1,
|
||
|
|
result = Array(nativeCeil(length / size));
|
||
|
|
|
||
|
|
while (index < length) {
|
||
|
|
result[++resIndex] = baseSlice(array, index, (index += size));
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = chunk;
|