Examples From Structure and Interpretation of Computer Programs.. I decided to go through and make some of my previously private gists into public ones.

sicp.js

  inc = function(x) {
    return x + 1;
  };

  square = function(x) {
    return x * x;
  };

  cube = function(x) {
    return x * x * x;
  };

  deriv = function(g) {
    var dx;
    dx = 0.00001;
    return function(x) {
      return (g(x + dx) - g(x)) / dx;
    };
  };

  double = function(f) {
    return function(x) {
      return f(f(x));
    };
  };

  compose = function(f, g) {
    return function(x) {
      return f(g(x));
    };
  };

  repeated = function(f, n) {
    return function(x) {
      if (n === 1) {
        return f(x);
      } else {
        return (compose(f, repeated(f, n - 1)))(x);
      }
    };
  };