How does a data format like this recursion

let arr = [{
    role: "admin",
    left: "fzz",
    children: [{
        role: "other",
        right: "pdd",
        children: [{
            role: "admin"
        }]
    }] 
}]

how does a data format like this return an array recursively, leaving the data format unchanged, but taking out the role as admin? (including data in children should also be filtered for role.) if the parent role is not admin, both that level and its children will be discarded
return: 

arr = [{
    role: "admin",
    left: "fzz",
    children: [{
        role: "admin",
        right: "pdd"
    }]
}]
Javascript
Mar.06,2021

this demand is very different from before.
the answer is in response to the previous demand: return all admin and delete admin from children . 

getRoles(getData());

function getRoles(data, role = 'admin') {
  let resArr = [];

  main(data);

  return resArr;

  function main(data) {
    if (data && data.length) {
      data.forEach((d, i) => {
        if (d.role === 'admin') resArr.push(data.splice(i, 1));
        if (d.children && d.children.length) main(d.children);
      });
    }
  }
}

function getData() {
  return [{
    role: 'other',
    children: [{
      role: 'admin',
      index: '1'
    }, {
      role: 'other'
    }]
  },{
    role: 'admin',
    index: '2',
    children: [{
      role: 'other',
      children: [{
        role: 'admin',
        index: '3'
      }]
    }]
  }];
}
let arr = [{
    role: 'admin',
    left: 'fzz',
    children: [{
        role: 'other',
        right: 'pdd',
        children: [{
            role: 'admin'
        }]
    }] 
}]
arr.find(function(x){
    return x.role ==='admin';
})

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