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(function() {
  var json = {a: 1, b: 2};
  // Encode.
  var str = JSON.stringify(json);
  
  // Decode.
  var decoded = JSON.parse(str);
})();

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NSString *formatted = [NSString stringWithFormat: @"Hello, %@!", @"World"];

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// Int string -> Number
parseInt('123.456')  // => 123

// Float string -> Number
parseFloat('123.456')  // => 123.456

// Any
Number('123.456')  // => 123.456

// Hex string -> Number

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NSString *nsstr = [NSString stringWithUTF8String:cstr];

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// See. http://stackoverflow.com/a/22224493
// See also. http://caniuse.com/#feat=classlist
elem.classList.add('foobar');
elem.classList.remove('foobar')
elem.classList.contains('foobar')

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0000 0123                          ori.b   #$23, D0
0001 0123                          ori.b   #$23, D1
0002 0123                          ori.b   #$23, D2
0003 0123                          ori.b   #$23, D3
0004 0123                          ori.b   #$23, D4
0005 0123                          ori.b   #$23, D5
0006 0123                          ori.b   #$23, D6
0007 0123                          ori.b   #$23, D7
0010 0123                          ori.b   #$23, (A0)
0011 0123                          ori.b   #$23, (A1)

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using Parse;

...

  public void RequestFoobars(List<string> foobarIds) {
    Dictionary<string, object> data = new Dictionary<string, object>();
    data.Add("foobarIds", foobarIds);
    ParseCloud.CallFunctionAsync<List<object>>("getFoobars", data).ContinueWith(t => {
        if (t.IsFaulted || t.IsCanceled || !t.IsCompleted || t.Result == null) {
          Debug.Log(t.Exception.GetBaseException().Message);

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curl --header 'Authorization: key=＜APIキー＞' \
     --header Content-Type:"application/json" \
     https://android.googleapis.com/gcm/send \
     -d '{"registration_ids":["＜端末の登録ID＞"],"data":{"message":"Hello", "url": "http://www.example.com/"}}'

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// ex. Dictionary<string, string> dic;
foreach (KeyValuePair<string, string> pair in dic) {
    Debug.Log(pair.Key + ": " + pair.Value);
}

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# Convert string encoding

# options:
#   -e [encoding]   Target encoding (default: utf-8)

require 'kconv'
require 'optparse'

def convert_encoding(lines, to)
  encoding = Kconv.guess(lines.join)