I have a JSON file with data inside. I have to filter the data by : if user has more than two names, and if user ids are consecutive. The JSON file :
[
{
"_id": "62bd5fba34a8f1c90303055c",
"index": 0,
"email": "mcdonaldholden@xerex.com",
"nameList": [
{
"id": 0,
"name": "Wendi Mooney"
},
{
"id": 2,
"name": "Holloway Whitehead"
}
]
},
{
"_id": "62bd5fbac3e5a4fca5e85e81",
"index": 1,
"nameList": [
{
"id": 0,
"name": "Janine Barrett"
},
{
"id": 1,
"name": "Odonnell Savage"
},
{
"id": 2,
"name": "Patty Owen"
}
]
}, ...
I have managed to find an a solution to filter if the users have more than two names : userData.filter((names,i) => { return names?.nameList?.filter(names => { return names.name;}).length > 2 ; })
But I cant seem to grasp myself around the concept of filtering the consecutive ids.
Also I was advised to not use any for loops at all. Only ES6 array loops like map, forEach and filter.
Here's a solution that uses every() to compare the ID of every element with the previous ID:
const result = data.filter(({nameList}) =>
nameList.length > 2 &&
nameList.every(({id}, i, a) => !i || id === a[i - 1].id + 1)
);
Complete snippet:
const data = [{
"_id": "62bd5fba34a8f1c90303055c",
"index": 0,
"email": "mcdonaldholden@xerex.com",
"nameList": [{
"id": 0,
"name": "Wendi Mooney"
}, {
"id": 2,
"name": "Holloway Whitehead"
}]
}, {
"_id": "62bd5fbac3e5a4fca5e85e81",
"index": 1,
"nameList": [{
"id": 0,
"name": "Janine Barrett"
}, {
"id": 1,
"name": "Odonnell Savage"
}, {
"id": 2,
"name": "Patty Owen"
}]
}];
const result = data.filter(({nameList}) =>
nameList.length > 2 &&
nameList.every(({id}, i, a) => !i || id === a[i - 1].id + 1)
);
console.log(result);