75th: For loop under pattern matching

Today we learned the For loop content under pattern matching. Let's start with the code combat perspective.

For (I<-list (1,2,3,4,5)) println (i)//is actually called by the foreach

for ([email protected]"Flink" <-List ("Hadoop", "Spark", "Flink")) println (index)//for parameter matching by individual name

For (language, "Hadoop") <-Set ("Scala", "Spark", "Java", "Hadoop")) println (language)//to match a parameter initialization

For ((K,v:int) <-List (("Spark", 5), ("Hadoop", "Bigdata")) println (v)//Match by type

Let's analyze each of them. The first one is familiar, looping through the elements. What we're going to say here is that we're actually using foreach in the loop.

def foreach[b] (f:a = B) {
var these = this
while (!these.isempty) {
F (These.head)
these = These.tail
}
}

Second, we assign index to alias Flink, match it by Alias, and then print. The use of this is also foreach:

def foreach[u] (f:a = U): Unit

Third, we initialize one of the key values and then pattern match through the initialized values. The use of this is also foreach:

def foreach[u] (f:a = U): Unit

Finally, we do pattern matching by defining the type of the key value, which is also used by foreach:

def foreach[u] (f:a = U): Unit

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75th: For loop under pattern matching