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Effect.succeed
Create an Effect with a known value
Daily Effect
This is a beginner-friendly course to get familiar with the Effect ecosystem. The aim of this course is to help you discover the most commonly used functions in the Effect libraries. The Effect docs are very thorough, but newcomers may find them overwhelming.
This course would make a great companion to other entry-level Effect courses. I really appreciated Sandro Maglione's course and Ethan Niser's workshop.
Effect consists of many libraries, each with many modules, each with many functions. In each lesson, we'll explore a single function. Thankfully, the most useful functions are often the simplest to understand.
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Effect.runSyncExecute an Effect synchronously, returning its value
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Effect.syncCreate an Effect that defers execution
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Effect.mapTransform the value inside an Effect
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Effect.failCreate an Effect that fails immediately
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Effect.flatMapEffectfully transform the value inside an Effect
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pipePass a value along a pipeline of functions
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Effect.catchAllProvide a fallback effect to use if something goes wrong
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Effect.tryAttempt a synchronous operation that may fail
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Effect.runPromiseExecute an Effect asynchronously, returning its value in a Promise
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Effect.promiseCreate an Effect that wraps an asynchronous computation
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Effect.tryPromiseWrap an asynchronous computation that may fail
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Effect.catchTagHandle a specific error based on tag
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Data.TaggedErrorDefine a new type of error
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Effect.genUse generator function syntax to write readable effect logic
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Context.TagDefine a tagged service for dependency injection
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Effect.provideServiceProvide a tagged service to the relevant effect
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Effect.provideServiceEffectEffectfully provide a tagged service to the relevant effect
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Context.GenericTagDefine a Tag for use with Context
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Context.addAdd a new item to an existing context
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Context.getGet a service from a context
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Context.emptyCreate an empty context
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Context.makeCreate a Context with one item
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Context.mergeCombine two Contexts
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Context.mergeAllCombine many contexts into a single bigger context
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Effect.provideProvide multiple services with a single call
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Layer.succeedConstruct a layer with a known value
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Layer.effectConstruct a layer effectfully
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Layer.succeedContextConstruct a layer from a Context
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Layer.effectContextConstruct a layer effectfully from a whole context
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Layer.failConstruct a layer that will fail
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Layer.mapTransform the context inside a Layer
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Layer.mergeCombine layers to widen the input and output
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Layer.provideCombine layers by feeding outputs of one layer as inputs to another
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Layer.emptyCombine layers by feeding outputs of one layer as inputs to another
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Layer.mergeAllCombine many layers to widen the input and output
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Layer.catchAllDeal with errors raised while building a Layer
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Effect.tapUse the result of an Effect without changing the return value
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Effect.zipRun two effects (sequentially or concurrently), returning the results of both
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Effect.zipLeftRun two effects, returning the results of the first
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Effect.zipRightRun two effects, returning the results of the second
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Effect.voidDo nothing
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Effect.asVoidHide the success value of an Effect
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Console.logEffectfully write a message to the console
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Console.errorEffectfully write an error to the console