Curry and compose for functional programming.

curry-compose.js

// adapted from:
// http://javascriptweblog.wordpress.com/2010/04/05/curry-cooking-up-tastier-functions/
// http://javascriptweblog.wordpress.com/2010/04/14/compose-functions-as-building-blocks/

function curry( fn ) {
  if ( arguments.length < 2 ) {
    return  fn;
  }
  var args = [].slice.call( arguments, 1 );
  return function() {
    return fn.apply( args.concat( [].slice.call( arguments ) );
  }
}

// like this h(x) = f(g(x))
function compose( fFn, gFn ) {
  return function() {
    var args = [].slice.call( arguments );
    return fFn.call( this, gFn.apply( this, args ) );
  };
};