Reduce for object in object in Array of Objects with FP

Question

I get the following data from an API:

[
    { names: { name: 'Pete', name;'Claus' } },
    { names: { name: 'Paul', name;'Claus' } },
    { ... }
]

How can I get an array containing only those objects that have the name Claus in them with reduce,filter, map and such methods?

This does it - but not in a functional style though:

var newMap = []
var map = this.array
for(var i = 0; i < map.length; i++) {
  for(var j = 0; j < map.length; j++) {
    if(map[i] && map[i].involvements[j])
      if(map[i].involvements[j].full_name === 'Claus') {
        newMap.push(map[i])
    }
  }
}
this.array = newMap

Some bits not very much though:

 search(){
    let map = this.submissions
    .map( (x,i) => x.involvements.filter(x => x.full_name === 'Claus'))
    .filter( x => x.length != 0 )
    console.log(map)
  }

Be sure about the JSON you're receiving because you won't be able to solve your problem with that invalid JSON. — Ele
– Ele, Commented Feb 21, 2018 at 11:23

Roman · Accepted Answer · 2018-03-05 10:45:54Z

Data Structure

Based on your code, you have the following data structure:

[
  {
    involvements: [
      { full_name: 'Claus' },
      { full_name: 'Peter Paker' }
    ]
  },
  // more involvements
]

Code

What you want to do is to filter if some involvement contains an object with the property full_name. Coincidentally there are the functions Array#filter and Array#some.

const search = (x, xss) =>
    xss.filter(xs => xs['involvements'].some(y => y['full_name'] === x))

search('Claus', data)

Working Code Example

const data = [{
    involvements: [{
        full_name: 'Claus'
      },
      {
        full_name: 'Peter Parker'
      }
    ]
  },
  {
    involvements: [{
        full_name: 'Clark Kent'
      },
      {
        full_name: 'Kristin Wells'
      }
    ]
  }
]

const search = (x, xss) =>
  xss.filter(xs => xs['involvements'].some(y => y['full_name'] === x))

console.log(
  search('Claus', data)
)

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