Python To Scala

Strings

Python and Scala share some syntax regarding String operations, and what differs is straightforward:

Python

>>> foo = "bar"
>>> foo[1]
'a'
>>> len(foo)
3
>>> foo + str(1)
'bar1'
>>> foo.split("a")
['b', 'r']
>>> "foo   ".strip()
'foo'
>>> "String here: {}, Int here: {}".format("foo", 1)
'String here: foo, Int here: 1'
>>> foo.upper()
'BAR'

Scala

scala> val foo = "bar"
foo: String = bar

scala> foo(1)
res19: Char = a

scala> foo.length
res2: Int = 3

scala> foo + 1.toString
res3: String = bar1

scala> foo.split("a")
res10: Array[String] = Array(b, r)

scala> "fooo   ".trim
res11: String = fooo

scala> "String here: %s, Int here: %d".format("foo", 1)
res13: String = String here: foo, Int here: 1

// Scala lacks some of the convenience operators, but makes it easy to map over strings
// Note the use of _ here to indicate the each variable passing into map.
scala> foo.map(_.toUpper)
res18: String = BAR

Scala 2.10 and up features a very nice string interpolation syntax, which will look familiar to Coffeescript users:

Scala

scala> val fruit = "apple"
fruit: String = apple

scala> val apple_count = 5
apple_count: Int = 5

scala> val veg = "broccoli"
veg: String = broccoli

scala> val broc_count = 10
broc_count: Int = 10

scala> s"I have $apple_count $fruit and $broc_count $veg. In total I have ${apple_count + broc_count}."
res15: String = I have 5 apple and 10 broccoli. In total I have 15.

Both languages let you easily iterate over individual characters in a String:

Python

for c in foo:
    print(c)
b
a
r

Scala

scala> for (c <- foo) println(c)
b
a
r

Scala's multiline strings will look very familiar to Python programmers:

Python

>>> """
... This is
... a multiline string
... """
'\nThis is\na multiline string\n'

Scala

scala> """
     | This is
     | a multiline string
     | """
res8: String =
"
This is
a multiline string
"