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/*!
* EJS - Filters
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* First element of the target `obj`.
*/
exports.first = function(obj) {
return obj[0];
};
/**
* Last element of the target `obj`.
*/
exports.last = function(obj) {
return obj[obj.length - 1];
};
/**
* Capitalize the first letter of the target `str`.
*/
exports.capitalize = function(str){
str = String(str);
return str[0].toUpperCase() + str.substr(1, str.length);
};
/**
* Downcase the target `str`.
*/
exports.downcase = function(str){
return String(str).toLowerCase();
};
/**
* Uppercase the target `str`.
*/
exports.upcase = function(str){
return String(str).toUpperCase();
};
/**
* Sort the target `obj`.
*/
exports.sort = function(obj){
return Object.create(obj).sort();
};
/**
* Sort the target `obj` by the given `prop` ascending.
*/
exports.sort_by = function(obj, prop){
return Object.create(obj).sort(function(a, b){
a = a[prop], b = b[prop];
if (a > b) return 1;
if (a < b) return -1;
return 0;
});
};
/**
* Size or length of the target `obj`.
*/
exports.size = exports.length = function(obj) {
return obj.length;
};
/**
* Add `a` and `b`.
*/
exports.plus = function(a, b){
return Number(a) + Number(b);
};
/**
* Subtract `b` from `a`.
*/
exports.minus = function(a, b){
return Number(a) - Number(b);
};
/**
* Multiply `a` by `b`.
*/
exports.times = function(a, b){
return Number(a) * Number(b);
};
/**
* Divide `a` by `b`.
*/
exports.divided_by = function(a, b){
return Number(a) / Number(b);
};
/**
* Join `obj` with the given `str`.
*/
exports.join = function(obj, str){
return obj.join(str || ', ');
};
/**
* Truncate `str` to `len`.
*/
exports.truncate = function(str, len){
str = String(str);
return str.substr(0, len);
};
/**
* Truncate `str` to `n` words.
*/
exports.truncate_words = function(str, n){
var str = String(str)
, words = str.split(/ +/);
return words.slice(0, n).join(' ');
};
/**
* Replace `pattern` with `substitution` in `str`.
*/
exports.replace = function(str, pattern, substitution){
return String(str).replace(pattern, substitution || '');
};
/**
* Prepend `val` to `obj`.
*/
exports.prepend = function(obj, val){
return Array.isArray(obj)
? [val].concat(obj)
: val + obj;
};
/**
* Append `val` to `obj`.
*/
exports.append = function(obj, val){
return Array.isArray(obj)
? obj.concat(val)
: obj + val;
};
/**
* Map the given `prop`.
*/
exports.map = function(arr, prop){
return arr.map(function(obj){
return obj[prop];
});
};
/**
* Reverse the given `obj`.
*/
exports.reverse = function(obj){
return Array.isArray(obj)
? obj.reverse()
: String(obj).split('').reverse().join('');
};
/**
* Get `prop` of the given `obj`.
*/
exports.get = function(obj, prop){
return obj[prop];
};
/**
* Packs the given `obj` into json string
*/
exports.json = function(obj){
return JSON.stringify(obj);
};
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