Remainder after dividing by 1?

Question

JavaScript

And so in js there is an operator % remainder of division, it is convenient for them to check the evenness of a number ( n%2 == 0 ) and ATTENTION is it an integer of the type if the number is an integer then num%1 will be zero if the fraction is 0+fraction but I can’t understand because if you divide the number by 1, then there will be a number and not 0, that is, the remainder will always be the number that we divided by 1.
Maybe I don’t know math well, or is it fun js explain please.
Sorry for the letter too lazy to put the Russian layout.

Answer 1

% is the operation of taking the remainder of the division, not the quotient. The remainder of dividing any integer by 1 is 0, since any integer can be represented as a sum of units, and 1 is divisible by 1 without a remainder.
Example:
3% 1 = 3 (mod 1) = 1 + 1 + 1 (mod 1) = 0 + 0 + 0 = 0

Answer 2

if the number is an integer then num%1 will be zero

An integer divided by 1 always gives itself:
x : 1 = x