Nothing

As explained in Functional Programming in JavaScript

A Maybe case that represents the absence of a value or a failure without extra detail.

How Functional Programming in JavaScript covers it

How deep it goes

Defines the empty Maybe case and shows how it preserves map chains and fallback handling, but not custom Nothing internals.

Examples

Uses safe student lookup, chained property access, and the error 'Can't extract the value of a Nothing.'

What it assumes

Assumes basic null checks and introduces Maybe and its empty branch from scratch.

What you can do after

Apply Maybe to keep missing data explicit while chaining operations and supplying defaults.

How it connects

Connects to Maybe, Just, map, getOrElse, fromNullable, and null handling.

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Also explained in

• 

  liveBookmanning.com
  Learn Haskell by ExampleNothing is the Maybe constructor representing the absence of a contained value.

Compare how 2 books explain Nothing →

Related concepts

• maybe functionpart of · The maybe function eliminates a Maybe value by returning a default for Nothing or applying a handler to the contained value.
• readMaybeproduced by · readMaybe is a Haskell function that parses a String into a value of a Read instance and returns Nothing when parsing fails.
• optionuses · An option type is a type that explicitly represents either a value of a specified type or the absence of a value.
• Justalternative to · Just is a constructor of the Maybe type that represents a present value by wrapping it.
• monadpart of · A monad is a functional abstraction that encapsulates computational context and provides operations for composing computations while preserving that context.

This explainer was generated by Manning's knowledge graph from the text of Functional Programming in JavaScript. The section links point to the parts of the book it draws on.