const a1 = [1,3,4,11] const a2 = [2,4,10,13,34] const mergeSortedArrays = (arr1,arr2) => { //TODO: make sure that arrays are sorted, and are arrays, and only include numbers const newArr = []; arr1p = 0; arr2p = 0; for(i = 0; i < (arr2.length + arr1.length); i++ ){ if(arr1[arr1p] <= arr2[arr2p]) { newArr.push(arr1[arr1p]) arr1p++ }else{ newArr.push(arr2[arr2p]) arr2p++ } } return newArr } console.log(mergeSortedArrays(a1,a2))