Merge two Sorted Arrays

mergeSort.js

(function mergeSort(array1, array2) {

	var i = 0;
	var j = 0;
	var result = [];

	while (i <= array1.length && j <= array2.length) {
		if (array1[i] > array2[j]) {
			if (typeof array2[j] !== 'undefined') {
				result.push(array2[j]);
			}
			if (typeof array1[i] !== 'undefined') {
				result.push(array1[i]);
			}
		} else {
			if (typeof array1[i] !== 'undefined') {
				result.push(array1[i]);
			}
			if (typeof array2[j] !== 'undefined') {
				result.push(array2[j]);
			}
		}

		++i;
		++j;
	}

	return result;

})([0, 3, 5, 7], [1, 2, 4, 6, 8]);