Scala cast any to int

  • Scala cast any to int. You have to convert them. In most cases it will be a tuple of size 2. select($"_c2". However, if anyValue is not an Int , a ClassCastException will be thrown at runtime. You have a Map[String, String] and therefore you can't cast the values to Int. Asking for help, clarification, or responding to other answers. NET compiler are finished or Scala. scala&gt; val aFloat = 1. Oct 28, 2023 · We want to cast anyValue to an Int. For example I have a program that requires the user to enter in a number "five", and multiply that by another int. BoxesRunTime. Ive tried using an array of numbers Int, a 32-bit signed integer (equivalent to Java's int primitive type) is a subtype of scala. 5f aFloat: Float = 1. SortedMap. 6 Scala 2. It can be used in more complicated code, such as when you need to interact with Java and send it an array of Object instances: Feb 28, 2024 · Scala FAQ: How do I convert between numeric data types in Scala, such as from Int to Long, Int to Double, etc. How to convert any a number Apr 13, 2010 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand How to convert List[Any] to List(Int,Int) in scala? 2. Convert List[Any] to tuple with different type values. The toInt method will throw an Exception in case of an incorrect number Apr 9, 2013 · You are not casting. toInt) toOption Jun 8, 2022 · The Scala kind hierarchy starts with Any, that's the supertype of all types. ClassCastException: java. The direct subclasses of Any are AnyVal and AnyRef. Instances of Int are not represented by an object in the underlying runtime system. 9f f1: Float = 14. Try scala> val i1: Int = 23 i1: Int = 23 scala> val l1: Long = 42 l1: Long = 42 scala> val f1: Float = 14. Integer at scala. case d: Double => d. Mar 18, 2024 · Converting an Int to a String is handled using the toString method: scala> val i: Int = 42 i: Int = 42 scala> i. The function that receives this message needs to see the specific types of the tuple elements: Dec 19, 2013 · The first is a String and the rest are numbers (either Int or Double) so I am using Any* to get the arguments. lang. Try import scala. Instead of using the “cast” approach in Java, use the to* methods that are available on all of Scala’s numeric types. I'm passing it into a function and I'd like to do some implicit conversions as such: implicit def asInt( _in:Option[Object] ) = _in Dec 7, 2016 · Here's what I get in my scala REPL: scala> val myLong = 100L myLong: Long = 100 scala> val msg : String = myLong+"" msg: String = 100 You can definitely do string concatenation in Scala for any object. asInstanceOf[Float] res13: Float = 0. option("inferSchema", true). Oct 19, 2018 · I would like to cast scala collection types, such as Seq[Any] to Seq[(String, String)], without it producing a Warning. Boolean which lacks this function. A universal trait is a trait that extends Any, only has defs as members, and does no initialization. Jan 10, 2018 · My Spark program needs to read a file which contains a matrix of integers. } Nov 16, 2013 · I have a variable of type Any with runtime type of String which I want to cast to Int: val a: Any = "123" If I try to cast in to Int, I'll get an exception java. map {. Scala：将字符串转换为整数的方法 在本文中，我们将介绍在Scala中如何将字符串转换为整数。 阅读更多：Scala 教程 1. 0. 9931625E7, "2. Syntax: In the first four examples, if you don’t explicitly specify a type, the number 1 will default to an Int, so if you want one of the other data types—Byte, Long, or Short—you need to explicitly declare those types, as shown. toList. A Jun 28, 2024 · When you need to convert a String to an Int in Scala, use the toInt method, which is available on String objects, like this: scala> val i = "1". asInstanceOf[Int] mean? I tried the following in REPL: scala> null. Nov 7, 2018 · How about: scala> import scala. Columns are separated with ",". You could also cast the list, node. 10 Convert List[Any] to List[Int] 0 How to cast Any to Array[T] maintaining Scala's invariance for arrays. Thus as stated before you can use getOrElse if you can provide a sensible default value or handle the Exception. Jul 5, 2012 · If an Int can't be null, what does null. . May 11, 2020 · Cast Any of String to Int. define implicit conversion from Int. Provide details and share your research! But avoid …. i: Int = 1. get java. fromInt(Int n). asInstanceOf[List[DomText]], but you would get a warning, as this cast is done without any check because of type erasure (just as in java). x map (_ + 1) res2: Option[Long] = Some(100) or Scala 如何将 Any 类型转换为 Integer 在本文中，我们将介绍如何在 Scala 中将 Any 类型转换为 Integer。 Any 是 Scala 的超类，它可以表示任何类型的值。而 Integer 是一个包装类型，用于表示整数值。 要将 Any 类型转换为 Integer 类型，我们可以使用 asInstanceOf 方法。 The scala package contains core types like Int, Float, Array or Option which are accessible in all Scala compilation units without explicit qualification or imports. get thus you will not gain any benefits from using an Option type. val myMap = SortedMap[[Integer,Integer] val theGotten = myMap. It defines certain universal methods such as equals, hashCode, and toString. collect. See full list on baeldung. There is an implicit conversion from scala. Scala short and type safe cast operator. cast(IntegerType)). ), AnyRef represents reference types. So what is the one-line, canonical solution in Scala for extracting true from a string? Aug 2, 2016 · Java (and Scala) allows you to cast a primitive double to int (in Scala's case, Double to Int). What is the implicit conversion from Char to Int actually returning? It appears to be adding 48 to all the values. If anyValue is indeed an Int , the cast will succeed, and intValue will have the value 42. Try def toOptInt(s:String) = Try(s. In Scala, if we want to convert a String to an Integer, we can use the toInt method. The first column is my original "age" column and the data is imported from . toInt - 48) the results are correct. Aug 1, 2017 · If you insist on having to deal with Any, a safe way to convert it to an int would be something like this: def toInt(x: Any): Option[Int] = x match {. case i: Int => i. ClassCastException: val b = a. Assuming I know t Aug 27, 2017 · You can get it as Integer from the csv file using the option inferSchema like this : . java:105) at test. Scala Method on Generic Data Type. asInstanceOf[Long] b: Long = 10 scala> val c = a. asInstanceOf[Int]. toInt res0: Int = 42. I need to do some raw data parsing and I am forced to work with Any type. scala) 'Some code' A2 println(f(3)) Output: 3. Now that the column type is Int you can again use getInt where it failed earlier: trainingCoordDataFrame. Is there Scala equivalent of C# "as" keyword? 9. toInt. You can parse numbers from strings in Scala by using the to* methods that are available on a String (courtesy of the Scala StringLike trait): Feb 10, 2013 · I think the biggest problem here is, that you seem to confuse casting and conversion. AnyVal. Jun 16, 2011 · whichever writing of the cast suits you better. The idiomatic scala way would be using map or a for-comprehension. On the other hand, you cannot cast java. Typically, when you start to see Anys and other super-generic types inferred, it's Scala's type system telling you that the code you've written does not mean what you think it Sep 11, 2015 · I have List[Any] which has values List((0,0), (1,1), (1,3), (2,2), (3,1)) I want to convert it into List[(Int,Int)] How can I do this? Well I expected some form of implementation like Int. Why don't 'ints' cast to 'longs' in scala. let us assume the code is: var arr = readLine(). util. asInstanceOf[Float] res15: Float = 1. An explicit cast will still not make these types align, you need to convert one type to another. 在 Scala 中，如果我们想将 String 转换为 Integer，我们可以使用 toInt 方法。它在 String 对象上可用。 语法： scala> None. 10 it is possible to directly extend Any using universal traits. Int => scala. asInstanceOf[WrappedArray[Int]] wrapped. The answers of @Sergey Lagutin and @jwvh are perfectly fine. case i: Int => Some(i) case _ => None. 7. Starting with Scala 2. I like to just call toString on it though. As @jwvh points out, it is possible to cast an Int to a Float and vise versa: scala> (1. So instanceOf[Int] is the way of casting, but toInt is a method defined in Double, and more type safe - I would prefer it. Something like: def cast[T](o: Any): Option[T] = o match { case v: T =&gt; Some(v) case _ =&gt; None } or: def cast[T](c: Class[T], o: Any): Option[T] = o match Sep 22, 2015 · Technically speaking, from the point of view of Scala, Java SE is a third-party library … however, at least until the long talked about but never materialized native LLVM compiler or the abandoned . May 31, 2018 · val w : WrappedArray[Int] = 1 to 10 toArray val a : Any = w //a is now just like the variable you've got //cast the Any to a Wrapped array. Int. asInstanceOf[Number]. But it needs too much Nov 11, 2018 · How to cast Long to Int in Scala? 8. Double to java. 5. getOrElse(aKey,0) returns an Int Nov 5, 2012 · While for the arithmetic types, they aren't derived from each other, so I think we don't call it 'casting' then - but I'm not sure (but I'm sure, that Int isn't derived from Double). Notable packages include: scala. runtime. object. 0 But a conversion from java Oct 9, 2014 · Having a Map[String, Any] in the first place is a sign something has probably gone off the rails, although without any code to look at, I can't really help you there. Converting types in Scala. First, we can use the toInt method: scala> "42". asInstanceOf[Int] res14: Int = 1 scala> (1). Nov 13, 2017 · I'm using Spark 1. Any is the supertype of all types, also called the top type. getClass) Output: int Variant B Jul 19, 2017 · Because N is of type Int and not of type Float. It is available on String objects. 使用toInt方法 Scala提供了一个方便的方法toInt，可以将字符串转换为整数。这种方法适用于输入的字符串表示一个有效的整数。 Mar 20, 2010 · I'm working with legacy Java code which returns java. Jul 28, 2022 · You can use it to cast numeric types: scala> val a = 10 a: Int = 10 scala> val b = a. getOrElse(aKey,0) returned an Any but val myMap = SortedMap[[Int,Int] val theGotten = myMap. It's easy enough to switch to using the original Java version of a boolean, but that just doesn't seem right. JS takes off, I think we can safely assume that Java SE libraries (or at least the subset which also exists on Android) are available in any and all Scala Apr 29, 2019 · Im having trouble with converting a string to an integer in scala. toBigDecimal(Int n) or BigDecimal. ) from a String in Scala?Solution. 10. asInstanceOf[Int] How do I do that then? Feb 12, 2018 · Given a list that is structured like this (with mixed integers, Double s, and String s): val l = List[Any](2. Whereas AnyVal represents price kinds (which includes Int, Double, and so on. This method is defined in Class Any which is the root of the scala class hierarchy (like Object class in Java). 5 How to cast aFloat to an Int in a simple way? I already know to use a. main(test. Feb 3, 2024 · Scala FAQ: How do I parse a number (Int, Long, Float, BigInt, BigDecimal, etc. Every class in a Scala execution environment inherits directly or indirectly from this class. csv("file-location") That being said : the inferSchema option do make mistakes sometimes and put the type as String. asInstanceOf[Double] res14: Double = 0. longValue)) foreach (println(_)) Success(23 Oct 16, 2011 · How do you type cast Char/Int in Scala? 68. These methods can be demonstrated in the REPL (note that you need to hit the [Tab] key at the end of For getting an option in any case, regardless of possible exceptions due to number malformation, import scala. map(r => r. ? Solution. mytest$. Dec 6, 2012 · I have a Scala function which passes message of type 'Any'. We want to cast anyValue to an Int. However when I do that the number "five" is not holding any numerical value . With (Char)aNumber you are trying to invoke a method aNumber in the object Char: scala> val aNumber = 97 aNumber: Int = 97 scala> val aChar = (Char)aNumber <console>:5: error: value aNumber is not a member of object Char val aChar = (Char)aNumber ^ You can do In Scala, all values have a type, including numerical values and functions. How can I cast Integer to String in Scala? 1. toString res0: String = 42. Double cannot be cast to java. However, if anyValue is not an Int, a ClassCastException will be thrown at runtime. If instead I do product = product * (x. 9940714E7, 2. RichInt which provides useful non-primitive operations. If anyValue is indeed an Int, the cast will succeed, and intValue will have the value 42. 1. I read the file as a dataf Apr 26, 2015 · I am very new to Scala, and I am not sure how this is done. getByXPath(xPath). mutable. 9 scala> val d1: Double = 14. 13. Hot Network Questions Nov 30, 2014 · Exception in thread "main" java. asInstanceOf[Byte] c: Byte = 10. I would like to treat the numbers uniformly as Doubles, but I cannot just use asInstanceOf[Double] on the numeric arguments. read. Refer to the column itself instead of the column name and then cast the column to IntegerType. 0 'Some code' A3 println(f(3). Boolean is hidden by scala. As you can see, I just cast the string "1" to an Int object using the toInt method, which is available to any String. How can I serialize to Array[Byte] and back? I found examples related to other types such as Double or Int, but not to Any. asInstanceOf[Int] res12: Int = 0 scala> null. 0 scala> null. Jun 7, 2022 · 本文将解决在 Scala 中将 String 转换为 integer。 在 Scala 中使用 toInt 方法将字符串转换为整数. if so you can use the cast operator on Column Feb 2, 2024 · This article will tackle converting a String to an integer in Scala. e, instance) from one type to another type, it is obligatory to use asInstanceOf method. Example code: val seqs: Seq[Any] = Seq("1 Class Any is the root of the Scala class hierarchy. split(" ") Now arr is a string array. To convert between a String and an Int there are two options. csv and I couldn't get all of the data into a DF unless I left it as a string, now that I have the "age" column in, I'm trying to convert/cast the field and query against it. I want to convert this value to Array[Byte]. 0). – May 7, 2019 · B) Cast the entire column to Int. val df = spark. It always succeeds if casting to a more general type than the statically known type of the value. Number of columns is not the same each time I run the program. The diagram below illustrates a subset of the type hierarchy. foreach{ i => println(i) } Sep 29, 2010 · This should be a silly question. It can fail dynamically if casting to a type that the value could have but does not and is rejected by the compiler if the type to which the value is being cast is neither a supertype nor a subtype of the statically known type. Assuming I know t Apr 26, 2015 · I am very new to Scala, and I am not sure how this is done. Scala Type Hierarchy. getInt(0)). Jun 3, 2022 · In order to cast an Object (i. collection and its sub-packages contain Scala's collections framework Dec 7, 2018 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. mytest. The asInstanceOf method belongs to concrete value members of Class Any which is utilized to cast the receiver Object. collection. While hardware designs ultimately operate on vectors of binary digits, other more abstract representations for values allow clearer specifications and help the tools generate more May 2, 2011 · How to do simple type cast in Scala? 1. com Jun 8, 2022 · In order to cast an Object (i. List[Int] => Int without String Conversion? 0. If the data I read is in any numeric format (Int/Double/Long/) I need to convert it to Double, otherwise (eg. Aug 2, 2023 · UInt is a chisel data type, mean while Int is a scala data type. unboxToInt(BoxesRunTime. . 96 d1: Double = 14. Apr 17, 2012 · for import scala. Sep 7, 2016 · I have a variable value declared as Any in my program. Use the toInt Method in Converting String to Integer in Scala. 96 scala> val b1: Boolean = true b1: Boolean = true scala> List(i1, l1, f1, d1, b1) map (x => Try(x. 0 It would expect a runtime exception (NPE or ClassCastException) in that case. scala:10) at test. I have googled it with no luck. Any has two direct subclasses: AnyVal and AnyRef. Probably want to do this inside a try/catch val wrapped = a. toList C) Cast each value individually However in Scala, java. 345E8", 345563) You can convert it to list of integers as follows: val lAsInts = l. When you declare the Double as an Any, you're explicitly asking the compiler to forget that you gave it a Double. Oct 29, 2023 · In this example, anyValue is of type Any, which is a superclass of all Scala types. String) I However, I'm getting back doesn't make any sense. NoSuchElementException: None. Chisel datatypes are used to specify the type of values held in state elements or flowing on wires. daxmw mibnl uvps ggaayt khed zwbcyf iua upypuj htof seguga