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Perform a mathematical operation on a variable with another constant or variable. The += (et al) operators are just a convenient shorthand for the expanded syntax, listed below.
x += y; // equivalent to the expression x = x + y; x -= y; // equivalent to the expression x = x - y; x *= y; // equivalent to the expression x = x * y; x /= y; // equivalent to the expression x = x / y;
x: any variable type
y: any variable type or constant
x = 2; x += 4; // x now contains 6 x -= 3; // x now contains 3 x *= 10; // x now contains 30 x /= 2; // x now contains 15
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