python-scala-functional

Python to Scala Functional Programming

This skill focuses on functional patterns and collection transformations.

Lambdas and Functions

• Python: lambda x: x * 2
• Scala: (x: Int) => x * 2 or _ * 2 (placeholder syntax).

Collection Operations

Operation	Python	Scala
Map	map(f, items)	items.map(f)
Filter	filter(p, items)	items.filter(p)
Reduce	functools.reduce(f, items)	items.reduce(f)
For-each	for x in items: do(x)	items.foreach(do)
Zip	zip(a, b)	a.zip(b)
Sort	sorted(items, key=...)	items.sortBy(...)

Lazy Sequences

• Python: Generators (yield) and Iterator.
• Scala: LazyList, Iterator, or View.

Higher-Order Functions

Scala supports HOFs natively.

def applyFunc(f: Int => String, x: Int): String = f(x)

Pattern Matching (Instance Checks)

Instead of isinstance, use match for clean type dispatch.

value match {
  case s: String => "string"
  case i: Int    => "int"
  case _         => "unknown"
}