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scalafunctional-programmingbigdecimalfoldleft

foldLeft sum values with BigDecimal.ZERO start value

I have requirement where I want sum values of all employee salaries in list

employeeList.foldLeft(java.math.BigDecimal.ZERO) { (accSal,emp) => accSal + getSalary(emp,designation,yearsOfExp) }

Here for each employee I want to call a function getSalary and sum the return values to get salaries of all employees

The above code does not seem to work for me , Keep getting error

Type mismatch expected:String actual:BigDecimal
Solution

  • Alternative to Mario's answer, if getSalary returns a java.math.BigDecimal, and the fold should also return one, instead of a scala.math.BigDecimal.
    You can do this:

    employeeList.foldLeft(java.math.BigDecimal.ZERO) {
  (accSal, emp) =>
    accSal.add(getSalary(emp,designation,yearsOfExp))
}

    You can check the javadoc to confirm that they do not have a + method, but an add one.
    And for that reason, it was calling the + method that returns Strings.