oo-native-ext

Extensions to native objects

Install

npm install oo-native-ext

Extensions

String#toPascalCase()

Capitalizes the first letter of a string

"exampleString".toPascalCase() == "ExampleString"

String#format(obj)

Formats a string with key => value pairs

"My {obj} is {color}".format({
    obj: "car",
    color: "blue"
});
// "My car is blue"
 
"It is {0} minutes and {1} seconds after {2}pm".format([8, 12, 5]);
// "It is 8 minutes and 12 seconds after 5pm"

Date#getDayWestern()

Retrieves the day of the week, with monday = 0, sunday = 6

(new Date("1 january 2014")).getDayWestern() == 0;
(new Date("1 january 2014")).getDay() == 1;

Date#getHoursPeriodic()

Retrieves the hours on a 12 hour clock

(new Date("1 january 2014 06:30")).getHoursPeriodic() == 6
(new Date("1 january 2014 18:30")).getHoursPeriodic() == 6

Date#format(format, locale)

Formats a date

• format The format to use, values are wrapped in {}
• locale Object containing localization strings (defaults to english)

var date = new Date("1 january 2014 19:30:44");
 
date.format("{d}/{M}/{yy}") == "1/1/14";
date.format("{dd}-{MM}-{yyyy}") == "01-01-2014";
date.format("{dddd} {dd} {MMMM} {yyyy}") == "Monday 1 January 2014";
date.format("{HH}:{mm}:{ss}") == "19:30:44"

Format

• s: seconds between 0 and 59
• ss: seconds between 00 and 59
• m: minutes between 0 and 59
• mm: minutes between 00 and 59
• h: hours between 1 and 12
• hh: hours between 01 and 12
• H: hours between 0 and 23
• HH: hours between 00 and 23
• d: day between 1 and 31
• dd: day between 01 and 31
• ddd: abbreviated name of day (mon, tue, ...)
• dddd: name of day (monday, tuesday, ...)
• M: month between 1 and 12
• MM: month between 01 and 12
• MMM: abbreviated name of month (jan, feb, ...)
• MMMM: name of month (january, february, ...)
• yy: year between 00 and 99
• yyyy: year

Locale

var locale = {
    days: ["Monday", "Tuesday", ...],
    daysShort: ["Mon", "Tue", ...],
    months: ["January", "February", ...],
    monthsShort: ["Jan", "Feb", ...]
};

Function#memoize()

Memoize the results in a function for optimization

 
var faculty = function(n) {
    if (n == 0) return 1;
    return faculty(n - 1) * n;
}.memoize();
 
faculty(4); // requires 5 recursive calls
faculty(4); // result is already known
faculty(5); // requires 1 call

Function#curry(params...)

Curry function parameters

 
var prop = function(property, obj) {
    return obj[property];
};
 
[{name: "Ben"}, {name: "Jan"}, {name: "Bart"}].map(prop.curry("name"));
// ["Ben", "Jan", "Bart"]