Learn ECMAScript - Second Edition

The Math.imul(number1, number2) function

The Math.imul() function takes two numbers as 32-bit integers and multiplies them. It returns the lower 32 bits of the result. This is the only native way to do 32-bit integer multiplication in JavaScript. Here is an example to demonstrate this:

console.log(Math.imul(590, 5000000)); //32-bit integer multiplicationconsole.log(590 * 5000000); //64-bit floating-point multiplication

The output is as follows:

-13449672962950000000

Here, when multiplication was done, it produced a number so large it couldn't be stored in 32 bits; therefore, the lower bits were lost.