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parameterMystery10

Language/Type: JavaScript parameters return

The following console program uses parameters and produces four lines of output. What are they? 

function main() {
    let x = 5;
    let y = 1;
    let z = 9;
    let w = y + 2;
    surprise(x, y);
    x = surprise(z, w);
    w++;
    z = surprise(w, x);
    surprise(y, z);
}

function surprise(y, x) {
    x++;
    console.log(x + " " + y);
    y--;
    return x;
}
line 1
line 2
line 3
line 4

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