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How to get the product of two integers without using * JavaScript
We are required to write a function that takes in two numbers and returns their product, but without using the (*) operator.
Trick 1: Using Divide Operator Twice
We know that multiplication and division are just the inverse of each other, so if we divide a number by other number’s inverse, won’t it be same as multiplying the two numbers?
Let’s see the code for this −
const a = 20, b = 45; const product = (a, b) => a / (1 / b); console.log(product(a, b));
Trick 2: Using Logarithms
Let’s examine the properties of logarithms first −
log(a) + log(b) = log(ab)
So, let’s use this property of logarithms to our good. The code for this will be −
Example
const a = 20, b = 45;
const product = (a, b) => {
const logProduct = Math.log(a) + Math.log(b);
return Math.round(Math.exp(logProduct));
};
console.log(product(a, b));Output
The output in the console for both will be −
900
Updated on: 19-Aug-2020
194 Views
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