Import picocli.CommandLine import import import import java.io.File import import import import ( name = "checksum", mixinStandardHelpOptions = true, version = "checksum 4.0", description = "Prints the checksum (SHA-256 by default) of a file to STDOUT. Best Practices for Command Line Interfaces Improved Support for Chinese, Japanese and Korean Use Case: Configure Log Level with a Global Option Option Names or Subcommands as Option Values It is also possible to convert one Duration unit to another, though it is currently still behind an experimental flag. Println((12.hours + 30.minutes).toDouble(DurationUnit.DAYS)) The inWhole methods also allow for simple rounding of units for a better reader experience println((12.hours + 30.minutes - 6.milliseconds).inWholeDays) The API offers many conversion methods, from one Duration unit to another, but also into more common units like Long, or Double. Println(ZERO) // 0s The API comes with many conversion functions Println((2.hours - 3.days).absoluteValue) // 2d 22h ZERO is also a thing, and it comes with no rounding errors val minusOneDay = (-1).days The API handles negative values nicely, as well as (positive and negative) infinite values. val oneWeek = 1.week ⚠️Nope, won't work⚠️ Negative durations, and Infinite durations are completely OK days, hours, minutes, seconds, nanoseconds are available Using random () function A simple approach to retrieve an arbitrary element from the specified range is to use the random () function. Println(tenDays + fiveNanoseconds) // 10d 0h 0m 0.000000005s Twitter Facebook In Kotlin, you can use this handy NumberPicker extension dialog which scales your Double values into a fitting Int range and converts the. This article explores different ways to generate random numbers between the specified range in Kotlin. Printing Durations also returns very human readable results (which is the point, so that's expected □). No need to search for weeks, months or years. The first, and nice thing of the duration API is that it provides a nice DSL to manipulate time durations, from nanoseconds up to days. It aims to be able to represent very precise values (up to the Nanosecond), and is especially suited to calculated the execution time of a code block, for example. ![]() It is the operator form of rangeTo () function. It will create a range from the start to end including both the values of start and end. Double, BigDecimal, or Float ), you no longer provide a gapSize argument as the ranges in the bin model will. There are three ways for creating Range in Kotlin Using (.) operator Using rangeTo () function Using downTo () function (.) operator It is the simplest way to work with range. There are already multiple ways to calculate time in Java, so why the need for a Kotlin variant?įrom the proposal itself, The Duration API aims at helping to solve the representation of the interval between two moments in time. When binning continuous numerical types (e.g. Mastering High Performance with Kotlin: Overcome performance difficulties in Kotlin with a range of exciting techniques and solutions - Kindle edition by. You can directly run the code I present below in the Kotlin playground!Īfter looking at Kover last week, I spent some time diving into one of the other news of the Kotlin 1.6 release : The DurationAPI coming out of Experimental and is available for all flavours of Kotlin (so JS as well □)! Let's look quickly together what it has to offer! Why a Duration API? If offers the obvious but also nice extra goodies like coercions and ISO/ String conversions and is notably used to calculate processing time. TL DR : The DurationAPI is coming out of experimental stage, and offers a nice DSL to easily work with Time durations (duh!).
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