Computer scienceProgramming languagesScalaControl flowControl structures

For-comprehension

Theory

How many filters?

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Consider the following snippet: 

case class Phone(id: Long, name: String, model: Int)

def getListOfPhones(): List[Phone] = ???
def getDataByPhone(id: Long): List[String] = ???

for
  phone <- getListOfPhones() if phone.model >= 14
  data <- getDataByPhone(phone.id)
  trimmed = data.trim
  if trimmed.nonEmpty
yield data

How many times withFilter is involved in total?

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