Math.imul()
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The Math.imul() static method returns the result of the C-like 32-bit multiplication of the two parameters.
{{InteractiveExample("JavaScript Demo: Math.imul()")}}
```js interactive-example console.log(Math.imul(3, 4)); // Expected output: 12
console.log(Math.imul(-5, 12)); // Expected output: -60
console.log(Math.imul(0xffffffff, 5)); // Expected output: -5
console.log(Math.imul(0xfffffffe, 5)); // Expected output: -10
## Syntax
```js-nolint
Math.imul(a, b)
Parameters#
a- : First number.
b- : Second number.
Return value#
The result of the C-like 32-bit multiplication of the given arguments.
Description#
Math.imul() allows for 32-bit integer multiplication with C-like semantics. This feature is useful for projects like Emscripten.
Because imul() is a static method of Math, you always use it as Math.imul(), rather than as a method of a Math object you created (Math is not a constructor).
If you use normal JavaScript floating point numbers in imul(), you will experience a degrade in performance. This is because of the costly conversion from a floating point to an integer for multiplication, and then converting the multiplied integer back into a floating point. However, with asm.js, which allows JIT-optimizers to more confidently use integers in JavaScript, multiplying two numbers stored internally as integers (which is only possible with asm.js) with imul() could be potentially more performant.
Examples#
Using Math.imul()#
Math.imul(2, 4); // 8
Math.imul(-1, 8); // -8
Math.imul(-2, -2); // 4
Math.imul(0xffffffff, 5); // -5
Math.imul(0xfffffffe, 5); // -10
Specifications#
{{Specifications}}
Browser compatibility#
{{Compat}}