CODEWITHSUNDEEP
haskell
Andrey Bushman
Andrey Bushman

Reputation: 12506

Is my understanding of *mapping* correct?

I learn Haskell. When I'm reading books (the russian translate of them) I often see the mapping word... I'm not sure I understand it right.

In my understanding: the mapping - this is the getting of new value on the base of some old value. So it is a result of any function with parameters (at least one), or data constructor. The new value isn't obliged to have the same type, as old.

I.e.

-- mapping samples:
func a b = a + b 
func' a = show a
func'' a = a
func''' a = Just a

Am I right?

Upvotes: 0

Views: 73

Answers (1)

Sibi
Sibi

Reputation: 48664

Yes what you have understood is correct. Mapping means getting new values based on the old value by applying it to some function. The new value may or may not be of the same type (of the old value). In mathematics, the word mapping and function is actually used interchangeably.

There is another concept related to mapping: map

map is a famous higher order function which can perform mapping on a list of values.

λ> map (+ 1) [1,2,3]
[2,3,4]

In the previous example, you are using the map function to apply the function (+ 1) on each of the list values.

Upvotes: 2

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