Multiplication (*)

The * operator is overloaded for two types of operands: number and BigInt. It first coerces both operands to numeric values and tests the types of them. It performs BigInt multiplication if both operands become BigInts; otherwise, it performs number multiplication. A TypeError is thrown if one operand becomes a BigInt but the other becomes a number.

2 * 2; // 4
-2 * 2; // -4

Infinity * 0; // NaN
Infinity * Infinity; // Infinity

Other non-BigInt values are coerced to numbers:

"foo" * 2; // NaN
"2" * 2; // 4

2n * 2n; // 4n
-2n * 2n; // -4n

You cannot mix BigInt and number operands in multiplication.

2n * 2; // TypeError: Cannot mix BigInt and other types, use explicit conversions
2 * 2n; // TypeError: Cannot mix BigInt and other types, use explicit conversions

To do multiplication with a BigInt and a non-BigInt, convert either operand:

2n * BigInt(2); // 4n
Number(2n) * 2; // 4

• Addition (+)
• Subtraction (-)
• Division (/)
• Remainder (%)
• Exponentiation (**)
• Increment (++)
• Decrement (--)
• Unary negation (-)
• Unary plus (+)