compose-p

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

2 KB

Performs right-to-left composition of one or more Promise-returning functions.

Async

Promise

1 contributor

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composeP (

functions:...Function

) : Function

Performs right-to-left composition of one or more Promise-returning functions. The rightmost function may have any arity; the remaining functions must be unary.

Example

const db = {
       users: {
         JOE: {
           name: 'Joe',
           followers: ['STEVE', 'SUZY']
         }
       }
     }

     // We'll pretend to do a db lookup which returns a promise
     const lookupUser = (userId) => Promise.resolve(db.users[userId])
     const lookupFollowers = (user) => Promise.resolve(user.followers)
     lookupUser('JOE').then(lookupFollowers)

     //  followersForUser :: String -> Promise [UserId]
     const followersForUser = R.composeP(lookupFollowers, lookupUser);
     followersForUser('JOE').then(followers => console.log('Followers:', followers))
     // Followers: ["STEVE","SUZY"]

Argument

functions: ...Function

The functions to compose

Returns

Function