const array = [[3,2,1], [6,5,4]]; let mergedArrays = []; for(let i = 0; i < array.length; i++) { for(let j = 0; j < array[i].length; j++) { mergedArrays.push(array[i][j]); } } for(let i = 0; i < mergedArrays.length; i++) { for(let j = 0; j < mergedArrays.length; j++) { let tempNum = null; if(mergedArrays[j] > mergedArrays[j + 1]) { tempNum = mergedArrays[j]; mergedArrays[j] = mergedArrays[j + 1]; mergedArrays[j + 1] = tempNum; } } } console.log(mergedArrays);