1a = b = 5; // same as writing a = (b = 5);
2

1console.log(3 + 10 * 2);   // logs 23
2console.log(3 + (10 * 2)); // logs 23 because parentheses here are superfluous
3console.log((3 + 10) * 2); // logs 26 because the parentheses change the order
4