A lambda, also called an arrow function in JavaScript, is a compact way to define a function value. section 3.3
myArg => myArg*2
This one-argument arrow function doubles its input. section 3.3
Lambda
A function that has no name.
How Secrets of the JavaScript Ninja, Second Edition covers it
- How deep it goes
- Introduces ES6 arrow syntax and flags a callback-related benefit, while deferring its explanation.
- Examples
- Uses `myArg => myArg*2` to show a one-argument arrow function doubling its input.
- What you can do after
- Build a concise arrow function using the form `myArg => myArg*2`.
- How it connects
- Connects arrow functions to JavaScript function literals, first-class function values, and callback functions.
Also explained in
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Kotlin in Action, 2EA function literal is source syntax that directly expresses a function value, including its parameters and body.
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The Well-Grounded Rubyist, Fourth EditionA lambda is a Ruby callable object representing an anonymous function with lambda-specific argument and return behavior.
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Pro ASP.NET Core 7, Tenth EditionA lambda expression is an anonymous function expression whose parameters and implementation can be used as a delegate or compatible callable value.
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Functional Programming in Scala, Second EditionA function expression without a declared name, typically written using parameter and body syntax.
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Grokking SimplicityA function expression that has no name and can be defined inline where it is used.
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C++ Concurrency in Action, Second EditionA lambda expression is a C++ expression that defines an unnamed callable, optionally capturing variables from its surrounding scope.
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Python How-ToThe lambda keyword introduces a Python expression that defines an anonymous function.
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The Art of CodeA lambda is an anonymous function value that can be passed, stored, returned, or invoked as data.
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Modern C, Third EditionAn anonymous function is a function construct without a program-level name, provided by a C extension for embedding callable behavior in expressions or macros.
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.NET in Action, Second EditionAn anonymous method is a C# method implementation declared without a named method declaration and commonly represented as a delegate or function value.
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100 Java Mistakes and How to Avoid ThemA lambda expression is an anonymous Java function-like expression that provides an implementation compatible with a functional interface.
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Python Workout, Second Editionlambda is Python syntax for creating an anonymous function from parameters and a single expression.
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100 Go Mistakes and How to Avoid ThemAn anonymous function is a function defined without an explicit name.
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Build Python Web Apps with StreamlitA lambda function is an anonymous Python function defined as a single expression, typically for short computations.
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Learn Go with Pocket-Sized ProjectsAn anonymous function is a function value declared without a name, typically for inline or temporary use.
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ASP.NET Core in Action, 3eA lambda expression is an anonymous function expression that can be passed or assigned as a value.
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The Quick Python Book, Fourth EditionA lambda expression is an anonymous function expression that evaluates to a function value and returns the value of its expression body.
Compare how 18 books explain lambda →
Related concepts
- functionkind of · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
- higher-order functionused by · A higher-order function is a function that accepts functions as arguments, returns functions as results, or both.
- functional interfaceuses · A functional interface is an interface with exactly one abstract operation, making it compatible with implementation by a function, lambda expression, or method reference.
- to_procproduced by · to_proc is a Ruby conversion method that produces a Proc callable from an object such as a symbol.
This explainer was generated by Manning's knowledge graph from the text of Secrets of the JavaScript Ninja, Second Edition. The section links point to the parts of the book it draws on.