array.push() and .toFixed – javascript

April 12, 2023

I am creating program for generating random numbers using javascript.
While writing the code, I observed this strange behaviour;(Or atleast strange to me).

Variable are:

M is Maximum of range in which random number has to be generated.(inclusive)
m is Minimum of range in which random number has to be generated.(inclusive)
q is Level of decimals; i.e, for 0.9, it is 1; for 0.09 and 0.99 it is 2 etc.
q1 is 10^q; i.e., if q=1, q1=10; if q=2, q1=100 etc.

And somewhere among my codes:

array.push(m+(((Math.round(((Math.random()*(M-m)) + (Number.EPSILON))) * q1) / q1))).toFixed(q);

This worked perfectly as intended.
But then I realised .toFixed(q) is outside the array.push;
I mean it is like

array.push(/*some code here*/).toFixed(/*another code here*/);

Even though it is working as intended I am curious that whether array.push() has method .toFixed().
So when I put:

array.push((m+(((Math.round(((Math.random()(M-m)) + (Number.EPSILON))) * q1) / q1))).toFixed(q));

and q=3 The result has last 3 digits as 0. For example:9.000.

So ultimately my questions are:

Why didn’t my code work as intended when I put .toFixed() inside parenthesis of array.push()?
Does array.push() has a method .toFixed()?

Sorry for my English if something is wrong, English is not my native tongue.
You can see my full code here:
https://github.com/vinob4u/vinob4u.github.io/blob/main/BlockRandom.html

>Solution :

Why didn’t my code work as intended when I put .toFixed() inside parenthesis of array.push()?

The purpose of toFixed is to convert a number to a string with the specified number of decimal places.

You said 9..toFixed(3) so it expressed 9 to three decimal places, which is "9.000".

It’s generally more useful when presenting numbers with a high degree of precision to something readable (e.g. 1.234567890.toFixed(3) would be "1.234").

You seem to want 9 / Math.pow(10, 3).