alejandro / helpers.js

Created January 21, 2012


    
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            // Extraido de https://github.com/visionmedia/finance/blob/master/lib/helpers.js
 
/**
 * Months.
 */
 
var months = [
    'January'
  , 'February'
  , 'March'
  , 'April'
  , 'May'
  , 'June'
  , 'July'
  , 'August'
  , 'September'
  , 'October'
  , 'November'
  , 'December'
];
 
/**
 * Pad `n` with leading zero.
 */
 
function pad(n) {
  return n < 10 ? '0' + n : n;
}
 
/**
 * Format date.
 *
 * @param {String} fmt
 * @param {Date} optional date
 * @return {String}
 */
 
exports.date = function(fmt, date){
  date = date || new Date;
  return fmt
    .replace(/mm/g, function(){
      return pad(date.getMonth());
    })
    .replace(/dd/g, function(){
      return pad(date.getDate());
    })
    .replace(/yy/g, function(){
      return pad(date.getFullYear().toString().substr(2));
    });
};
 
/**
 * Parse date in the format of `"mm/dd/yy".
 *
 * @param {String} str
 * @return {Date}
 */
 
exports.parseDate = function(str){
  var date = new Date
    , parts = str.split('/')
    , month = parseInt(parts.shift(), 10)
    , day = parseInt(parts.shift(), 10)
    , year = parseInt(parts.shift(), 10) + 2000;
 
  date.setMonth(month);
  date.setDate(day);
  date.setYear(year);
 
  return date;
};
 
/**
 * Return the month name for `n`.
 *
 * @param {Number} n
 * @return {String}
 */
 
exports.monthName = function(n){
  return months[n];
};
 
/**
 * Return month no for `name`.
 *
 * @param {String} name
 * @return {Number}
 */
 
exports.monthNumber = function(name){
  name = name.toLowerCase();
  for (var i = 0; i < 12; ++i) {
    if (name == months[i].toLowerCase())
      return i;
  }
};
 
/**
 * Check if `obj` has keys.
 *
 * @param {Object} obj
 * @return {Boolean}
 */
 
exports.empty = function(obj){
  return ! Object.keys(obj).length;
};
 
/**
 * Return the sum of `type` in `items`.
 *
 * @param {Object} items
 * @param {String} type
 * @return {Number}
 */
 
exports.total = function(items, type){
  return Object.keys(items).reduce(function(sum, key){
    if (type != items[key].type) return sum;
    return sum + items[key].amount;
  }, 0);
};
 
/**
 * Format `n` in dollars.
 *
 * @param {Number} n
 * @return {String}
 */
 
exports.money = function(n){
  return n.toFixed(2);
}