Closest Sum To A Target

let first = [1,8,5];
let second = [4,9,2];
let target = 7;


function solve(first,second,target){
    first.sort((a,b) => a-b);
    second.sort((a,b) => a-b);

    let x = first.length-1;
    let y = 0;
    let minDiff = Number.MAX_SAFE_INTEGER;
    let result = [];

    while(x>0 && y < second.length){
        let sum = first[x] + second[y];

        let diff = Math.abs(sum-target);

        if(diff < minDiff){
            result = [first[x],second[y]];
            minDiff = diff;
        }

        if(sum >= target){
            x--;
        }
        else{
            y++;
        }
    }
    console.log(result);

}

solve(first,second,target);