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@iandesj
Created November 6, 2020 19:37
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Exclude array items from another
const allClasses = [
{
id: 1,
name: 'Yoga 100',
enrolled: 10,
maxCapacity: 11,
},
{
id: 2,
name: 'Yoga 200',
enrolled: 11,
maxCapacity: 11,
},
{
id: 3,
name: 'Yoga 300',
enrolled: 8,
maxCapacity: 11,
},
{
id: 4,
name: 'Yoga 400',
enrolled: 1,
maxCapacity: 11,
},
{
id: 5,
name: 'Yoga 500',
enrolled: 10,
maxCapacity: 11,
},
];
const userEnrolledClasses = [
{
id: 34,
name: 'Yoga 300',
classId: 3,
},
{
id: 58,
name: 'Yoga 500',
classId: 5,
},
];
// Get just the id's of the classes the user is enrolled in
const userEnrolledClassIds = userEnrolledClasses.map(cls => cls.classId);
// Filter out all classes that the user is already enrolled in
const availableClasses = allClasses.filter(cls => !userEnrolledClassIds.includes(cls.id))
// This will print all classes the user is not enrolled in
console.log(availableClasses);
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