8. Validity Checker

function solve(arr){

    let x1 = Number(arr[0]);
    let y1 = Number(arr[1]);
    let x2 = Number(arr[2]);
    let y2 = Number(arr[3]);

    let first =  Number(distance(x1, y1,0, 0));
    let second =  Number(distance(x2, y2,0, 0));
    let third = Number(distance(x1, y1, x2, y2));


    isValidNumber(first, x1, y1, 0, 0);
    isValidNumber(second, x2, y2, 0, 0);
    isValidNumber(third, x1, y1, x2, y2);
}

//solve([3, 0, 0, 4])
//solve([2, 1, 1, 1])

function distance(x1, y1, x2, y2) {

    let distX = x1 - x2;
    let distY = y1 - y2;

    let result = Math.sqrt(Math.pow(distX,2)+ Math.pow(distY, 2));
    return result;
}

function isValidNumber(num, x1, y1, x2, y2){

    if(Number.isInteger(num)){
        console.log(`{${x1}, ${y1}} to {${x2}, ${y2}} is valid`)
    }
    else{
        console.log(`{${x1}, ${y1}} to {${x2}, ${y2}} is invalid`)

    }
}