The subtraction assignment operator (
-=) subtracts the value of the right operand from a variable and assigns the result to the variable.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Operator: x -= y Meaning: x = x - y
// Assuming the following variable // bar = 5 bar -= 2 // 3 bar -= 'foo' // NaN