fizzbuzz-one-liners.js

// Prints to browser console (Chrome, Firefox), no explicit ifs. Starts from 1.
for(i=0;i++<100;console.log([['fizz'][i%3],['buzz'][i%5]].join('')||i)); // 72 characters

// Writes to array 'a', no explicit ifs. Starts from 1.
for(a,i=0;i<100;a[i++]=([['fizz'][i%3],['buzz'][i%5]].join('')||i)); // 68 characters

// Returns an array (Firefox only), no explicit ifs, no explicit loops. Starts from 0.
Array.apply([],Array(100)).map((e,i)=>[['fizz'][i%3],['buzz'][i%5]].join('')||i) // 80 characters

fizzbuzz.js

function fizzbuzz( i ) {
  return [ [ 'fizz' ][i%3], [ 'buzz' ][i%5] ].join( '' ) || i;
}

for(i=0;i<100;console.log((++i%3?'':'fizz')+(i%5?'':'buzz')||i)); //66 characters :)

👏