Updating Objects and Arrays in State
State must be treated as read only. To change an object or array, build a new copy with spread syntax.
Examplereact
{ ...user, age: 37 } copies user and replaces age. If you instead did user.age++, React would not notice the change.
Quick check
How do you add an item to an array held in state?
Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.
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