Menu
Hi I am reading through input variables from "args" and I want to check whether the input is integer value. I followed this link
var param=0
...
args(j) match {
...
case args(j): Int => param =args(j)
...
}
but it gives me an error:
[error] '=>' expected but ':' found.
[error] case args(j): Int => param =args(j)
Can't figure out what is the problem!
760
The Number. isInteger() method returns true if a value is an integer of the datatype Number. Otherwise it returns false .
Use the getClass Method in Scala The getClass method in Scala is used to get the class of the Scala object. We can use this method to get the type of a variable.
We can use the isdigit() function to check if the string is an integer or not in Python. The isdigit() method returns True if all characters in a string are digits. Otherwise, it returns False.
Using Character.isDigit method returns true if the character is a number.
In this tutorial, we’ll see a few different solutions to check if a given string is a number using Scala. 2. Using Character.isDigit Checking if a String is a number is trickier than it sounds. If we’re sure there’s no decimal part, then we can leverage the Char.isDigit method: The Char.isDigit method returns true if the character is a number.
The getClass method in Scala is used to get the class of the Scala object. We can use this method to get the type of a variable. The output above shows that it prints java.lang.String when it comes to strings because Scala string is nothing but a wrapper around java.lang.String.
Therefore, by assigning different data types to variables, you can store integers, decimals, or characters in these variables. Scala has a different syntax for declaring variables. They can be defined as value, i.e., constant or a variable. Here, myVar is declared using the keyword var.
Immutable variables are defined by using the val keyword. The first letter of data type should be in capital letter because in Scala data type is treated as objects. Here, a name is the name of the variable, a string is the data type of variable and geeksforgeeks is the value that store in the memory. Another way of defining variable:
val isInteger = Try(args(j).toInt).isSuccess
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
