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extensions

Color 
* `textColorBasedOnLuminance`, calculate the correct text color for the background.
Commons 
* `let`, calls the specified function block with this value as its argument and returns its result.
DateTime 
final date = DateTime.now() // => Example: "12/03/2020 23:40:23"
date.startOfDay() // => "12/03/2020 00:00:00"
date.endOfDay() // => "12/03/2020 23:59:59"
date.yesterday() // => "11/03/2020 23:40:23"
date.tomorrow() // => "13/03/2020 23:40:23"

date.firstDayOfMonth() // => "01/03/2020 23:40:23"
date.lastDayOfMonth() // => "31/03/2020 23:40:23"
date.nextMonth() // => "12/04/2020 23:40:23"
date.previousMonth() // => "12/02/2020 23:40:23"
date.nextWeek() // => "19/03/2020 23:40:23"
date.previousWeek() // => "05/03/2020 23:40:23"
date.nextYear() // => "12/03/2021 23:40:23"
date.previousYear() // => "12/03/2019 23:40:23"

date.onlyDate() // => "12/03/2020 00:00:00"
date.onlyTime() // => "00/00/0000 23:40:23"
Iterable 
* `filterNull()`, remove all null values from this iterable.
* `groupBy`, group elements with criteria. If you want to sort the map, you should specify the **sprtingCriteria** param.