Lookup by ID
Easy · Objects
Write a function indexById that turns an array of objects into a lookup object. Each key is an item's id and each value is the whole item.
If two items share the same id, the later one wins.
Next: Mask a Card Number
Easy · Objects
Write a function indexById that turns an array of objects into a lookup object. Each key is an item's id and each value is the whole item.
If two items share the same id, the later one wins.
Next: Mask a Card Number