let d = [ {path: '/posts/', title: ' Posts ', parent: true}, 
     {path: '/posts/create', title: ' Posts Create', parent: false},
     {path: '/posts/edit', title: ' Posts Edit', parent: false},
     {path: '/laravel-page', title: ' Laravel Page', parent: false},
    ];

function array_sort(arr) {
  var cat = '';
  return arr.reduce((acc, cur) => {
    cur.child = [];
    let path = cur.path.split('/').filter(_ => _ != "");
    if(path.length === 1) {
      cat = path[0];
      acc.push(cur);
    } else {
      acc[acc.length-1].child.push(cur);
    }
    return acc;
  }, []);
}

console.log(array_sort(d));