CODEWITHSUNDEEP
javascriptramda.js
stahyz
stahyz

Reputation: 101

get value if not null with ramda js

How i write the code as functional if i has the value like this

const data = {
name: null,
email: null,
username: 'johndoo'
}

in this case if i write the function that return the display name i just wrote data.name || data.email || data.username

I try to use ramda like

const getName = R.prop('name')
const getEmail = R.prop('email')
const getUsername = R.prop('username')
const getDisplayName = getName || getEmail || getUsername

but doesn't work, how to write it in ramdajs

Upvotes: 2

Views: 10417

Answers (1)

stdob--
stdob--

Reputation: 29167

You need to use a logical or R.either:

const getDisplayName = R.either(getName, R.either(getEmail, getUsername))

Or more compact with R.reduce:

const getDisplayName = R.reduce(R.either, R.isNil)([getName, getEmail, getUsername])


const data = {
  name: null,
  email: null,
  username: 'johndoo'
}

const getName = R.prop('name')
const getEmail = R.prop('email')
const getUsername = R.prop('username')

const eitherList = R.reduce(R.either, R.isNil)

const getDisplayName = eitherList([getName, getEmail, getUsername])

console.log(getDisplayName(data))
<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

Upvotes: 7

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