Tiny FizzBuzz

explained.js

for (
    let /* index */ i = 0,
        /* Buzz */ x,
        /* Fizz */ y,
        /* Buzz string */ l,
        /* Empty string constant */ v = "",
        /* Fizz string */ m,
        /* Destructed the `console` for shorter code: */ { log: K } = console;
        /* We need to do the FizzBuzz calculation 100 times. */ i <= 100;
        /* And, of course, increment the index each time. Just a normal `for` loop so far. */ i++
)
    /* This variable tells us whether or not this number is a `Buzz` number */ (x = !(i % 5)),
    /* This variable contains whether or not this number is a `Fizz` number */ (y = !(i % 3)),
    
    /* Then, we turn that into a string if it's a `Buzz` number (notice the ternary) */ (l = x ? "Buzz" : v /* Or, we just use our empty string constant defined above */),
    /* Same as the above, but for `Fizz` */ (m = y ? "Fizz" : v),

    /* Then we pass them to the logger. If both `Fizz` and `Buzz` strings are empty, it's obviously neither `Fizz` nor `Buzz`. In that case, print out the index instead. */ K(m + l || i);

min.js

for(let i=0,x,y,l,v='',m,{log:K}=console;i<=100;i++)x=!(i%5),y=!(i%3),l=x?'Buzz':v,m=y?'Fizz':v,K(m+l||i)