just/packages/array-split/index.js at diff · hmmhmmhm/just

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module.exports = split;

split([]); // []

split([1, 2, 3, 4, 5]); // [[1, 2, 3, 4, 5]]

split([1, 2, 3, 4, 5, 6, 7, 8, 9], 3); // [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

split(['a', 'b', 'c', 'd', 'e'], 2); // [['a', 'b'], ['c', 'd'], ['e']]

split([1, 2, 3, 4, 5, 6, 7, 8], 3); // [[1, 2, 3], [4, 5, 6], [7, 8]]

split(null, 3); // throws

split([1, 2, 3, 4, 5, 6], '3'); // throws

split([1, 2, 3, 4, 5, 6], null); // throws

function split(arr, n) {

if (!Array.isArray(arr)) {

throw new Error('expected an array for the first argument');

}

if (n != null && typeof n != 'number') {

throw new Error('expected a number or null for the second argument');

}

n = n != null ? n : arr.length;

var len = arr.length;

var groups = [];

for (var i = 0; i < len; i += n) {

groups.push(arr.slice(i, i + n));

}

return groups;

}