interpolate.js

// Uber-basic templating.. good? bad? ugly?

function interpolate( str, data ) {
  data = data || window;
  return !str
    ? ''
    : str.replace( /{([^}]*)}/g, function(a,b){
        return data[ b ] || '';
      });
};

var data = { foo: 123, bar: 456 };
interpolate( 'http://example.com/{foo}/{bar}/', data ); // "http://example.com/123/456/"