Baseline Widely available
The subtraction assignment (-=) operator performs subtraction on the two operands and assigns the result to the left operand.
let a = 2;
console.log((a -= 3));
// Expected output: -1
console.log((a -= "Hello"));
// Expected output: NaN
x -= y is equivalent to x = x - y, except that the expression x is only evaluated once.
let bar = 5;
bar -= 2; // 3
Other non-BigInt values are coerced to numbers:
Subtraction assignment using BigIntslet foo = 3n;
foo -= 2n; // 1n
foo -= 1; // TypeError: Cannot mix BigInt and other types, use explicit conversions
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