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Showing content from https://webplatform.github.io/docs/javascript/operators/subtraction_assignment below:

subtraction assignment Summary

Subtracts the value of an expression from the value of a variable and assigns the result to the variable.

Syntax

result -= expression

Examples

var x = 5;
var y = 7;
y -= x; // result: y = 2

Remarks

Using the -= operator is exactly the same as doing the following:

result = result - expression