JavaScript Tips

Variables.coffee

###
This file assumes the existence of some function 'request', which takes a URL as it's first argument,
and a callback as it's second.
The callback, when the Request has completed, will be invoked with the HTTP response received from the URL as it's first argument
###

#- The HTML data received from google.com
html_data = [null]

#- Make a request to google.com, and get the response
request 'http://www.google.com', (response) ->
    #- Check that [response] is not 'null'
    if response?
        #- Sync [response] into the global scope
        html_data[0] = response
        
#- Now, print that result to the console
console.log html_data[0]
#- What do you think was just printed?

Variables.js

/**
 * This file assumes the existence of some function 'request', which takes a URL as it's first argument,
 * and a callback function as it's second.
 * The callback, when the Request has completed, will be invoked with the HTTP response received from the URL as it's first argument
 */
 
//- The HTML data received from Google.com
var html_data = null;

/**
 * Make a request to google.com, and get the response
 */
request('http://www.google.com', function(response) {
  //- Check that [response] is not 'null'
  if ((typeof response !== 'undefined') && (response !== null)) {
     //- Sync [response] into the global scope
     html_data = response;
  }
});

//- Now, print that result to the console
console.log( html_data );
//- What do you think was just printed?

wouldn't it just be http://www.google.com?