The remainder assignment (%=) operator performs remainder on the two operands and assigns the result to the left operand.
Syntax
x %= y
Description
x %= y is equivalent to x = x % y, except that the expression x is only evaluated once.
Examples
Using remainder assignment
let bar = 5;
bar %= 2; // 1
bar %= "foo"; // NaN
bar %= 0; // NaN
let foo = 3n;
foo %= 2n; // 1n