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When I type something into the Scala interactive console, the console prints the result of the statement. If the result is too long, the console crops it (scroll right to see it):
scala> Array.fill[Byte](5)(0)
res1: Array[Byte] = Array(0, 0, 0, 0, 0)
scala> Array.fill[Byte](500)(0)
res2: Array[Byte] = Array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
scala> "a"*5000
res3: String = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...
How can I print the same or equivalent output, for any given object (not just a collection or array) without the cropping occurring?
944
Method # 1: Using the “println” Command The “println” command in the Scala programming language is used to print a line while introducing a new line at the end. In this way, if you want to print more than one line, each of them will be printed on a separate line.
Console implements functions for displaying the stated values on the terminal i.e, with print, println, and printf we can post to the display. It is also utilized in reading values from the Console with the function from scala. io.
Using a thread to poll the input-readLine: // keystop1.sc // In Scala- or SBT console/Quick-REPL: :load keystop1.sc // As Script: scala -savecompiled keystop1.sc @volatile var isRunning = true @volatile var isPause = false val tInput: Thread = new Thread { override def run: Unit = { var status = "" while (isRunning) { ...
Println. In Scala we often have console programs that perform computations. The programs must write data to the console—or their results will remain unknown. Method notes. With print, println and printf we report to the screen. And with methods from scala.io.StdIn we read data from the console. We build interactive programs. Println example.
Console implements functions for displaying the stated values on the terminal i.e, with print, println, and printf we can post to the display. It is also utilized in reading values from the Console with the function from scala.io.StdIn. It is even helpful in constructing interactive programs.
Scala Console: println, printf and readLine Use console functions like println and printf. Read lines from the console. Println. In Scala we often have console programs that perform computations. The programs must write data to the console—or their results will remain unknown. Method notes. With print, println and printf we report to the screen.
To start the Scala REPL, type scala at your operating system command line: Welcome to Scala version 2.10.0 Type in expressions to have them evaluated. Type :help for more information. scala> _ Welcome, you’re now using the Scala REPL. Inside the REPL environment, you can try all sorts of different experiments and expressions:
The result is not "cropped", simply println is invoking java.lang.Arrays.toString() (since scala.Array is a Java array).
Specifically, Arrays defines a toString overload that works with Object, which calls the toString implementation of java.lang.Object on every element. Such implementation prints the reference of the object, so you end up with
[Lscala.Tuple2;@4de71ca9
which is an Array containing the reference 4de71ca9 to a scala.Tuple2 object.
That has been discussed in this ticket years ago.
In the specific case of arrays, you can simply do
println(x.mkString("\n"))
or
x foreach println
or
println(x.deep)
To answer your last edit, you can set the maximum lenght of the strings printed by the REPL
scala> :power
** Power User mode enabled - BEEP WHIR GYVE **
** :phase has been set to 'typer'. **
** scala.tools.nsc._ has been imported **
** global._, definitions._ also imported **
** Try :help, :vals, power.<tab> **
scala> vals.isettings.maxPrintString = Int.MaxValue
vals.isettings.maxPrintString: Int = 2147483647
try
x map println
or
x foreach println
try this
scala> :power
Power mode enabled. :phase is at typer.
import scala.tools.nsc._, intp.global._, definitions._
Try :help or completions for vals._ and power._
scala> vals.isettings.maxPrintString
res9: Int = 800
scala> vals.isettings.maxPrintString = 10000
vals.isettings.maxPrintString: Int = 10000
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