 | This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
|
This page provides the comparison tables of functional programming instructions between programming languages. Comparison of basic instructions of imperative paradigm is provided by the comparison of basic instructions.
List operations
Function applications and lists
For brevity, these words will have the specified meanings in the following tables (unless noted to be part of language syntax):
- funcN
- A function. May be unary or n-ary (or always unary for languages without n-ary functions).
- func1, func2, etc.
- functions of specific arity. func (with no number) is the same as func1, also known as a projection in many languages.
- pred
- Unary function returning a Boolean value. (ML type: 'a -> bool) (C-like type:
bool pred<T>(T t)). - list
- The list being operated on.
- args
- Comma-separated list of one or more argument names, in the form of arg1, arg2, ..., argn.
- pattern
- A pattern, in languages with pattern matching.
- val
- Any relevant value, depending on context.
| identity lambda | lambda | map | apply | filter | fold | sum | |
|---|---|---|---|---|---|---|---|
| Python | lambda x: x | lambda args: expr | map(func, list) | nfunc(*arguments) | filter(pred, list) | functools.reduce(func2, list) | sum(list) |
| Mathematica | #& | (expr)& (arguments are #1, #2, etc.)
Function |
Map
func /@ list |
Apply
nfunc@@args |
Select | Fold | Apply
Plus@@list |
| C# | x => x | (args) => expr | Enumerable.Select(list, func) | Requires reflection | Enumerable.Where(list, pred) | Enumerable.Aggregate(list, func2)
Enumerable.Aggregate(list, val, func2) |
Enumerable.Sum(list)
Enumerable.Sum(list, func) |
| Visual Basic .NET | Function(x) x | Function(args) expr | |||||
| F# (can use Enumerable as well) | id(built-in)
fun x -> x |
fun pattern -> expr | Seq.map func list | Seq.filter pred list | Seq.fold func2 val list | Seq.sum list
Seq.sumBy func list |
Numerical operations on lists
- comp
- a binary function that returns a value indicating sort order (an integer in most languages).
| sort | max | min | |
|---|---|---|---|
| Python | sorted(list) | max(list) | min(list) |
| Mathematica | Sort | Max | Min |
| C# | Enumerable.OrderBy(list, comp) | Enumerable.Max(list, func) | Enumerable.Min(list, func) |
| Visual Basic .NET | |||
| F# | Seq.sort list
Seq.sortBy comp list |
seq.max
seq.maxBy func list |
seq.min
seq.minBy func list |
Iterations on lists
| group by | |
|---|---|
| Python | itertools.groupby(list, func) |
| Mathematica | GroupBy |
| C# | Enumerable.GroupBy(list, func) |
| Visual Basic .NET | |
| F# | seq.groupBy func list |
Generating lists by combinatorics tools
- start
- first value of range.
- step
- increment of range.
- count
- number of items in range.
- last
- inclusive last value of range.
- end
- exclusive last value of range.
| Generate range (lazily) | Infinite range (lazily) | |
|---|---|---|
| Python | xrange(start, end, step) (Python 2)
range(start, end, step) (Python 3) |
itertools.count(start, step) |
| C# | Enumerable.Range(start, count) | Enumerable.Range(start, Int32.MaxValue) |
| Visual Basic .NET | ||
| F# | seq { start..step..last } | Seq.initInfinite func |
References
- ^ "Enumerable Class (System.Linq)". Microsoft Docs. Microsoft. Retrieved 2019-08-29.
- ^ "Collections.Seq Module (F#)". Microsoft Developer Network. Microsoft. Retrieved 2019-08-29.
- "itertools — Functions creating iterators for efficient looping". Python 3.7.4 documentation. Python Software Foundation. Retrieved 2019-08-29.
- "Built-in Functions". Python 2.7.16 documentation. Python Software Foundation. Retrieved 2019-08-29.
- "Built-in Types". Python 3.7.4 documentation. Python Software Foundation. Retrieved 2019-08-29.
- "GroupBy". Wolfram Language Documentation. Wolfram. Retrieved 2019-08-29.
 | This programming-language-related article is a stub. You can help Misplaced Pages by expanding it. |