Remove by Id

Immutable Arraysmedium

Course · Section 9: Data Structures, Modern Operators and Strings · Lecture 111: The Spread Operator (...)

Implement `removeById(list, id)` returning a new array without the item whose `id` matches.

Sample tests

Input: removeById([{"id":1},{"id":2}], 1)

Output: [{"id":2}]

Input: removeById([{"id":1}], 2)

Output: [{"id":1}]

+ 1 hidden test run on Submit.

Hints

Common pitfalls

indexOf followed by splice mutates the array and is fragile with object identity.
Comparing whole objects by reference instead of comparing the id field.

Learning resources

React: Updating Arrays in State

Approach & explanation (try first)

Identifying rows by a stable id is the React-friendly approach (it also gives you good keys). filter keeps every item except the one whose id matches, returning a new array.

⌘/Ctrl + Enter

Run your code to see results.

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