Comments (3)
Hi Laurent, if Iβm right chaining promises with .then()
in JS was already monadic π
from functional-programming-jargon.
Hello Laurent,
Thanks :)
I'm not new to (partly functional - pun intended) JS programming ;).
But I'm new to the concept of Monad in functional programming and it was not immediate for me that the explanation given in this repo applies also to JS Promises.
Monad
A monad is an object with of and chain functions.
chain is like map except it un-nests the resulting nested object.
// Implementation
Array.prototype.chain = function (f) {
return this.reduce((acc, it) => acc.concat(f(it)), [])
}
// Usage
Array.of('cat,dog', 'fish,bird').chain((a) => a.split(',')) // ['cat', 'dog', 'fish', 'bird']
// Contrast to map
Array.of('cat,dog', 'fish,bird').map((a) => a.split(',')) // [['cat', 'dog'], ['fish', 'bird']]
of is also known as return in other functional languages. chain is also known as flatmap and bind in other languages.
Now I see that new Promise()
has the role of of
and that indeed .then()
acts like chain()
.
But now I also find it strange that Array
was chosen as an example.
Was it because it could illustrate more explicitely the unnesting ?
from functional-programming-jargon.
But now I also find it strange that Array was chosen as an example.
Was it because it could illustrate more explicitely the unnesting ?
I donβt know π€ Maybe JS was chosen for this repository because it is a lingua franca that everyone knows enough to understand FP concepts implemented in it, whatever your language background is. In the same way arrays-like structures are implemented in most languages and most people know them, unlike promises.
from functional-programming-jargon.
Related Issues (20)
- Add a section on higher-kinded types HOT 2
- Explanation of `lens` HOT 2
- TOC refers to absent anchor tags HOT 2
- Idempotent inaccurate HOT 2
- Volunteering - Polish translation HOT 4
- Closure appears twice in the document HOT 2
- Avoid polluting globals HOT 2
- Add memoization HOT 1
- Add Identity Function
- Category, Functor, Monad, Comonad, etc. should mention algebraic laws HOT 1
- Natural transformations HOT 1
- Functors are maps for categories HOT 3
- Category example is a preorder/partial order HOT 1
- Suggestions from HN HOT 1
- Add Total Functions HOT 1
- Organize for extensibility HOT 3
- Functor example does not make any sense HOT 2
- Explain why HOT 1
- Is array concatenation a monoid?
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from functional-programming-jargon.