Merge sorted arrays

const a =[1,5,6,9,35];
const b =[0,0,2,8];

function mergeArray(a1,a2){
    let c = a1.concat(a2);
    c.sort(function(a,b) {
        return a-b;
    });
    console.log(c);
}

mergeArray(a,b);

function f(a,b){
}