JavaScript - groupby - filter 06

filter06.js

const toNewGroup = (field) => (result, obj) => {
  result[obj[field]] = (!result[obj[field]])
    ? [obj]
    : [...result[obj[field]], obj]
  return result
}

const groups = list.reduce(toNewGroup("level"), {})

console.log(groups)
/**
{ senior: 
  [ { id: 1,
      name: 'Suissa',
      active: true,
      level: 'senior',
      tags: [Array] },
    { id: 2,
      name: 'Bella',
      active: true,
      level: 'senior',
      tags: [Array] },
    { id: 3,
      name: 'Joana',
      level: 'senior',
      active: true,
      tags: [Array] } ],
 pleno: 
  [ { id: 4,
      name: 'John',
      level: 'pleno',
      active: false,
      tags: [Array] } 
  ] 
}
*/