Why?

why.js

function repeat(x,n) { var a=[]; for (;n>0;n--) a.push(x); return a; }

// returns an array of the first `n` natural numbers
function range(n) {
  return repeat('10', n+2).map(parseInt).slice(2).map(function(x) {
    return x-2;
  });
}

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, NaN, NaN, NaN, NaN, NaN]

function repeat(x,n) { var a=[]; for (;n>0;n--) a.push(x); return a; }

// returns an array of the first `n` natural numbers
function range(n) {
  return repeat('10', n+2).map(function(num) {return parseInt(num, 10);}).slice(2).map(function(x) {
    return x-2;
  });
}

[8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8]