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var baseSlice = require('../internal/baseSlice'),
isIterateeCall = require('../internal/isIterateeCall');
/** Native method references. */
var ceil = Math.ceil;
/* Native method references for those with the same name as other `lodash` methods. */
var 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(+size || 1, 1);
}
var index = 0,
length = array ? array.length : 0,
resIndex = -1,
result = Array(ceil(length / size));
while (index < length) {
result[++resIndex] = baseSlice(array, index, (index += size));
}
return result;
}
module.exports = chunk;
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