Calculating Derived State in JavaScript Using Selectorsby@nas5w
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Calculating Derived State in JavaScript Using Selectors

June 1st 2019
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by @nas5w 1,001 reads
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Selectors are functions that take state as a property and return the derived state value. This is because it’s inefficient to recalculate a selector if its input hasn’t fundamentally changed. Selectors can use higher order functions to compose selectors from other selectors. The result of a higher order function is based on the result of the function passed to create a new selector. The new selector will map over all the input functions to determine their results based on their results. The selector library includes additional functionality to memoize selector results.

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by Nick Scialli @nas5w.Husband, dog dad, coffee monster. Software engineer at the @usds! Opinions are my own
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