If I have an array of objects like so in playlists.json
"playlists" : [
{
"id" : "1",
"owner_id" : "2",
"song_ids" : [
"8",
"32"
]
},
{
"id" : "2",
"owner_id" : "3",
"song_ids" : [
"6",
"8",
"11"
]
},
{
"id" : "3",
"owner_id" : "7",
"song_ids" : [
"7",
"12",
"13",
"16",
"2"
]
}
]
and in Node I read in the file like this:
const data = JSON.parse(fs.readFileSync('playlists.json'));
I want to write a .filter() function that can search by id and mutate the result into a new array thereby removing the entry tested for.
Of course we can access the index like this: playlists[0].id);
How would write the .filter() to test for a certain id i.e. generate a new array with value removed? (mutate) I wrote some code below but it is wrong and noob.
const someId = "2"
const result = playlists.filter(playlist => playlist.id !== someId)
New array of result would contain:
"playlists" : [
{
"id" : "1",
"owner_id" : "2",
"song_ids" : [
"8",
"32"
]
},
{
"id" : "3",
"owner_id" : "7",
"song_ids" : [
"7",
"12",
"13",
"16",
"2"
]
}
]
You used filter fine, however, you have select the key from your json object. Below is an example.
const jsonFile = {
"playlists" : [
{
"id" : "1",
"owner_id" : "2",
"song_ids" : [
"8",
"32"
]
},
{
"id" : "2",
"owner_id" : "3",
"song_ids" : [
"6",
"8",
"11"
]
},
{
"id" : "3",
"owner_id" : "7",
"song_ids" : [
"7",
"12",
"13",
"16",
"2"
]
}
]
}
const someId = 2
const result = jsonFile.playlists.filter(playlist => playlist.id !== someId)
console.log(result)
After some inspection. I needed to used the parent object reference with playlists to achieve the proper result like so:
const someId = "2";
const result = data.playlists.filter(playlist => playlist.id !== someId)
console.log(result);