Verifying the numerical value of a decimal place

How can I determine if the 4th decimal place in a number is zero or not? I want to throw an error message if it is not zero. For instance, in the number 2.3189, the value of the 4th decimal place is 9. My current code works for most cases, but for example with the number 1.2570, it incorrectly identifies the 0 as not being a 0. On the other hand, checking 1.2580 correctly shows the 0 as a 0. Any assistance with this issue would be much appreciated.

!!(submission && (quantity * 10000 % 10) === 0);
javascript

Answer №1

I always make sure the fourth decimal place after the '.' is zero using regex.

var number = 0.554156;
/\.[0-9]{3}0/.test(number.toString())

Answer №2

One way to access the 4th decimal place in JavaScript is by using a special expression because of precision problems with the modulus operator.

const value = 1.2570;
console.log(Number(value.toFixed(4).split('.')[1][3]));

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