Replace value of key using ramda.js - ramda.js

Question

I have the following array of objects:
const originalArray = [
{name: 'name1', value: 10},
{name: 'name2', value: 20}
]
And the following object
names = {
name1: 'generic_name_1',
name2: 'generic_name_2'
}
I would like the first array to be transformed like this:
[
{name: 'generic_name_1', value: 10},
{name: 'generic_name_2', value: 20}
]
What I have tried so far:
const replaceName = (names, obj) => {
if(obj['name'] in names){
obj['name'] = names[obj['name']];
}
return obj;
}
const modifiedArray = R.map(replaceName(names), originalArray)
Is there a more ramda-ish way to do this?

Answer 1

Using native JS inside Ramda functions is not unramdaish. The only problem in your code is that you mutate the original object - obj['name'] = names[obj['name']];.
I would use R.when to check if the name exists in the names object, and if it does evolve the object to the new name. If it doesn't the original object would be returned.
const { flip, has, prop, map, when, pipe, evolve } = R
const hasProp = flip(has)
const getProp = flip(prop)
const fn = names => map(when(
pipe(prop('name'), hasProp(names)),
evolve({
name: getProp(names)
})
))
const originalArray = [{"name":"name1","value":10},{"name":"name2","value":20},{"name":"name3","value":30}]
const names = {"name1":"generic_name_1","name2":"generic_name_2"}
const result = fn(names)(originalArray)
console.log(result)
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.0/ramda.js"></script>

Answer 2

I wouldn't use any Ramda functions for this. I would simply avoid mutating the original, perhaps with code like this:
const transform = (names) => (arr) => arr .map (
({name, ... rest}) => ({name: names [name] || name, ... rest})
)
const originalArray = [{name: 'name1', value: 10},{name: 'name2', value: 20}]
const names = {name1: 'generic_name_1',name2: 'generic_name_2'}
console .log (
transform (names) (originalArray)
)