Code-golfed FizzBuzz

fizz-buzz.js

// [...Array(101)]     : is the shortest way to generate a range from [0..100]
// .map((_,n)=>        : The array is filled with undefined, so we use the index instead.
// "Fizz".slice(n%3&&4): (n%3) is truth-y for all non-multiples of 3. (n%3)&&4 is either 0 or 4.
// ||n                 : "Fizz".slice(4)+"Buzz".slice(4) is "", which is false-y, so we replace it with n
// .find               : .map returns an array, .find does not.
[...Array(101)].map((_,n)=>"Fizz".slice(n%3&&4)+"Buzz".slice(n%5&&4)||n).find(s=>console.log(s))

// An interesting, but longer variation:
// n%3&&1-n%5&&4       : returns either 4 for Buzz or 0 for Fizz and FizzBuzz. (other values are excluded by the length arg)
// (!(n%3)+!(n%5))*4   : returns 0, 4, or 8 for none, Fizz or Buzz, or FizzBuzz respectively.
[...Array(100)].map((_,n)=>"FizzBuzz".substr(n%3&&1-n%5&&4,(!(n%3)+!(n%5))*4)||n).find(s=>console.log(s))