Using ramda to modify a property in array of Objects

Question

I am trying to remove some properties from an array of objects using ramda. I have an array of properties to remove like:

const colToHide = ['name', 'age']; 
// those properties are selected by the user

And I want to remove the properties 'name' and 'age' (or any user selected property) from one array of objects. The array of objects is something like this:

const person = [
  {name:'sam', age:'24', address:'xyz avenue', employed:true},
  {name:'john', age:'25', address:'xyz avenue', employed:true}
];

What would be right way to update that array of object?

Shidersz · Accepted Answer · 2019-06-14 15:03:40Z

2

You can use the .omit() method in conjunction with a .map(). Something like this:

const person = [
  {name:'sam', age:'24', address:'xyz avenue', employed:true},
  {name:'john', age:'25', address:'xyz avenue', employed:true}
]

const omitKeys = (keys, arr) => R.map(R.omit(keys), arr);

console.log(omitKeys(["name", "age"], person));

.as-console {background-color:black !important; color:lime;}
.as-console-wrapper {max-height:100% !important; top:0;}

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

Even more, you can use .compose() as @ScottSauyet proposed on the comments to do:

const omitKeys = R.compose(R.map, R.omit);

And then use it as:

omitKeys(["name", "age"])(person);

const person = [
  {name:'sam', age:'24', address:'xyz avenue', employed:true},
  {name:'john', age:'25', address:'xyz avenue', employed:true}
]

const omitKeys = R.compose(R.map, R.omit);

console.log(omitKeys(["name", "age"])(person));

.as-console {background-color:black !important; color:lime;}
.as-console-wrapper {max-height:100% !important; top:0;}

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

edited Jun 14, 2019 at 15:03

answered Jun 13, 2019 at 21:11

Shidersz

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1 Comment

Scott Sauyet Over a year ago

And if you don't mind calling it like omit (keys) (xs), then this can be simplified to const omitKeys = compose (map, omit). You need something like the above (or Hitmand's useWith solution) to the the omit (keys, xs) API.

Hitmands · Accepted Answer · 2019-06-14 05:31:23Z

2

or in a point free style using R.useWith:

const omit = R.useWith(R.map, [
  R.omit, 
  R.identity,
]);

const persons = [
  {name:'sam', age:'24', address:'xyz avenue', employed:true},
  {name:'john', age:'25', address:'xyz avenue', employed:true}
]

console.log(
  'result',
  omit(["name", "age"], persons),
);

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

answered Jun 14, 2019 at 5:31

Hitmands

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