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zaetrik/monads-nested-contexts.ts

Created May 12, 2020 07:20
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Monads: Nested Contexts
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monads-nested-contexts.ts
import * as O from "fp-ts/lib/Option";
addTwo :: number -> Option<number>
const addTwo = (x: number) => O.some(x + 2);
// If we map() with addTwo we get a nested context
O.map(addTwo, O.some(5)) // => Option<Option<number>>
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