Fun(ctional) squaring

gistfile1.js

var n = 10;

// Simple squaring function
function square(n) {
  return n * n;
}

// Flip the first and second args of a function signature
function flip(fn) {
  return function(a, b) {
    return fn(b, a);
  }
}

// Return the value
function identity(val) {
  return val;
}

// Generate a dense array of undefined's
Array.dense = function dense(length) {
  return Array.apply(null, Array(length));
};

// Functionally generate an array of numbers between start (1) and end
Array.range = function range(end, start) {
  start = (start === undefined ? 1 : Number(start));
  return Array.dense(start + end).slice(start, end).map(flip(identity));
};

console.log(
  Array.range(n)
    .map(square)
    .join(' ')
);