Using an object anonymously in JavaScript

var month = 'Jan'; //or another three-letter abbreviation

//After the following operation, proper_month will contain the string "January".
var proper_month = {'Jan':'January',
                              'Feb': 'February',
                              'Mar' : 'March',
                              'Apr' : 'April',
                              'May'   : 'May',
                              'Jun'  : 'June',
                              'Jul'  : 'July',
                              'Aug'   : 'August',
                              'Sep'  : 'September',
                              'Oct'   : 'October',
                              'Nov'   : 'November',
                              'Dec'   : 'December'
                             
                             }[month];

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