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If you’re keeping track of a presentational component’s visibility in state, then you normally need to set up an initial state in your constructor and set up click handlers to deal with toggling that visibility. But through the clever use of some ES2015 features, you can get rid of a lot of the overhead you need to construct this. Check out this example:

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Pretty neat! That knocked this example component’s size down to about half of the other one. We use the fact that the initial state is falsey if it hasn’t been set to read from a default object. We also use an inline arrow function to toggle the visibility state, rather than extracting it out to a full class method.

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