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'use strict';

const x = 9;

function f1(val) {

val = val + 1;

return val;

}

f1(x);

console.log(x);

const y = { x: 9 };

function f2(val) {

val.x = val.x + 1;

return val;

}

f2(y);

console.log(y);

// Add your explanation as a comment here