The -=
operator performs subtraction on the two operands and assigns the result to the left operand.
The -=
operator performs subtraction on the two operands and assigns the result to the left operand.
x -= y
x -= y
is equivalent to x = x - y
, except that the expression x
is only evaluated once.
let bar = 5; bar -= 2; // 3 bar -= "foo"; // NaN let foo = 3n; foo -= 2n; // 1n
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Subtraction_assignment |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction_assignment