In exploring this issue further, I discovered an interesting example from a different topic. This example involves filtering a nested array within another array based on specified filter values.
Curiously, the method used in this example doesn't work effectively when there is only a single element in the array.
const data = [
{
"guid": "j5Dc9Z",
"courses": [
{
"id": 3,
"name": "foo"
}
]
},
{
"guid": "a5gdfS",
"courses": [
{
"id": 1,
"name": "bar"
},
{
"id": 3,
"name": "foo"
}
]
},
{
"guid": "jHab6i",
"courses": [
{
"id": 7,
"name": "foobar"
}
]
}
];
const courses = [3];
const result = data.filter(item => item.courses.every(course => courses.includes(course.id)));
console.log(result);
In the context of this specific scenario, we would expect to see two instances of the value '3', but instead, we are only getting the first one. How can we improve this filtering process for nested arrays with both multiple and single values?