function XO(str) {
nbx = 0;
nbo = 0;
let array = str.split('');
for(i = 0; i < array.length; i++) {
if (array[i] == 'x' | array[i] == 'X') { nbx++; }
if (array[i] == 'o' | array[i] == 'O') { nbo++; }
}
if (nbo == nbx && nbx == 0) { return true; }
else if (nbo == nbx && nbx != 0) { return true; }
else { return false; }
}
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