index-by

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

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2 KB

Given a function that generates a key, turns a list of objects into an object indexing the objects by the given key.

Function

Object

Utils

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indexBy (

fn:Function,

array:Array

) : Object

Given a function that generates a key, turns a list of objects into an object indexing the objects by the given key. Note that if multiple objects generate the same value for the indexing key only the last value will be included in the generated object.

Acts as a transducer if a transformer is given in list position.

Example

const list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
     R.indexBy(R.prop('id'), list);
     //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}

Arguments

fn: Function

Function :: a -> String

array: Array

The array of objects to index

Returns

Object

An object indexing each array element by the given property.