Scala: for loop works for any collection

‘for’ loop works for any collection.

Example 1: Traverse a string using for loop.

scala> for (data <- "Hello World"){
     |   println(data)
     | }
H
e
l
l
o
 
W
o
r
l
d

Example 2: Travers a List using for loop.

scala> for (data <- List(2, 3, 5, 7)){
     |   println(data)
     | }
2
3
5
7

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