Filter array object children javascript

Carlos Anez :

I need to filter an array with children

I'm using the .filter function and is not filtering the children the way I need

This is the object example

var arr =  {
       "items":[
          {
             "name":"Stackoverflow",
             "type":"development",
             "children":[
                {
                   "title":"web",
                   "titleName":"web site"
                },
                {
                   "title":"web",
                   "titleName":"site"
                }
             ]
          },
          {
             "name":"Jon Snow",
             "type":"actor",
             "children":[
                {
                   "title":"foo 2",
                   "titleName":"foo 3"
                },
                {
                   "title":"no foo",
                   "titleName":"bar 2"
                }
             ]
          }
       ]
    }

Code example:

var searchWord = 'foo'

arr.items.filter(item => {
    return (item.children.some(c => c.titleName.indexOf(searchWord) > -1))
})

this will return the items that have the filter correctly but I need that filters the children in the return

//The returned children
{ 
 "name":"Jon Snow",
 "type":"actor",
 "children":[{title: "foo 2", titleName: "foo 3"}, {title: "no foo", titleName: "bar 2"}]
}
//The expected should be 
{ 
 "name":"Jon Snow",
 "type":"actor",
 "children":[{title: "foo 2", titleName: "foo 3"}]
}

Christian Fritz :

You are not actually filtering the children, you are filtering only the top-level items.

This should work correctly:

var searchWord = 'foo'
res = arr.items.filter(item => {
  item.children = item.children.filter(c => c.titleName.indexOf(searchWord) > -1);
  return (item.children.length > 0);
})