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DynamicHelpers Ejemplo

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helpers.js
JavaScript
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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);
}

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