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type inference in scala

Sumit Rawal answered on August 28, 2023 Popularity 2/10 Helpfulness 1/10


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  • type inference in scala


    Here's how type inference works in Scala:

    Variable Declarations:

    When you declare a variable using the val or var keyword without specifying its type, the compiler infers the type based on the assigned value:

    val age = 25 // Compiler infers the type as Int

    val name = "Alice" // Compiler infers the type as String

    Function Definitions:

    When you define functions, the compiler infers the parameter types and return type based on the implementation:

    def add(a: Int, b: Int) = a + b // Compiler infers parameter and return types as Int


    The result of an expression is inferred based on the types of operands and operations:

    val result = 3.14 * 2 // Compiler infers the result type as Double

    Type Hierarchy:

    Scala's type inference system leverages the type hierarchy to infer the most specific common supertype of the involved expressions:

    val myList = List(1, 2, 3) // Compiler infers the type as List[Int]

    Type Annotations (Optional):

    While type inference is powerful, you can still provide explicit type annotations when necessary for clarity or to guide the compiler:

    val x: Double = 42.0

    Type inference improves code readability, reduces the likelihood of type-related errors, and promotes a more concise coding style. However, there may be cases where you want to provide explicit type annotations for documentation purposes or when the compiler requires more specific information.

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    Contributed on Aug 28 2023
    Sumit Rawal
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