Question

If you share a big box of toys using React Context, and a small toy part only needs one specific toy from the box, what special trick can you do so that the small toy part only changes when *its specific toy* changes, and not when any other toy in the big box changes?

Accepted Answer

When you share a big box of toys using React Context, the entire box is treated as a single JavaScript object. If the value of *any* toy (property) within that big box object changes, React perceives the *entire big box object&#x27;s reference* as having changed. Because the `useContext` hook triggers a re-render for any component consuming that context whenever its *value&#x27;s reference* changes, all components dependent on that big box will re-render, even if they only needed a specific toy that itself remained unchanged. This occurs because JavaScript uses reference equality for objects: two objects with identical properties are still considered different if they occupy different memory locations.

If you share a big box of toys using React Context, and a small toy part only needs one specific toy from the box, what special trick can you do so that the small toy part only changes when its specific toy changes, and not when any other toy in the big box changes?

When you share a big box of toys using React Context, the entire box is treated as a single JavaScript object. If the value of any toy (property) within that big box object changes, React perceives the *entir....

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If you share a big box of toys using React Context, and a small toy part only needs one specific toy from the box, what special trick can you do so that the small toy part only changes when *its specific toy* changes, and not when any other toy in the big box changes?

When you share a big box of toys using React Context, the entire box is treated as a single JavaScript object. If the value of *any* toy (property) within that big box object changes, React perceives the *entir....

If you share a big box of toys using React Context, and a small toy part only needs one specific toy from the box, what special trick can you do so that the small toy part only changes when its specific toy changes, and not when any other toy in the big box changes?

When you share a big box of toys using React Context, the entire box is treated as a single JavaScript object. If the value of any toy (property) within that big box object changes, React perceives the *entir....