curry.js

// include https://cdn.rawgit.com/ramda/ramda/master/dist/ramda.min.js
// var _ = require('ramda');

var foo = _.curry(function (a, b){
  return a + b;
});

var bar = foo(2); //=> function(b){ return 2 + b; }

bar(3); //=> 5

purevsimpure.js

function pure (a, b){
  return a + b;
}

var d = new Date();
var n = d.getSeconds();

function impure (a) {
  return a + n;
}