Function shift

external/.datatables.js:3625–3631

(a, i, j)

		var layout = []
		var unique
		var shift = function (a, i, j) {
			var k = a[i]
			while (k[j]) {
				j++
			}
			return j
		}

		// We know how many rows there are in the layout - so prep it
		for (i = 0, iLen = rows.length; i < iLen; i++) {