May 1, 2024
4 minute read
Closure in the context of programming refers to the ability of a function to remember the variables it had access to at the time of its creation. This means that the variables persist within the function's scope even after the execution of the function has completed. Closures are prevalent in various programming languages and notably in JavaScript. In JavaScript, closures can be created when a function is declared within another function, referred to as its parent function. The inner function obtains access to the variables in the scope of its parent function, giving rise to a closure. In essence, the inner function forms a closure around the variables in its parent function's scope.
Function Invocation and Closure
The invocation of a function creates a unique execution context which establishes the function's own scope. However, if the function includes a nested function, the nested function's scope is enclosed within the parent function's scope. When the nested function accesses variables declared in the parent function, they are stored in the closure. Consequently, the variables continue to exist even after the parent function has completed execution.
To illustrate this, consider the following function in JavaScript:
function outerFunction() {
let variableInParentFunction = 'Value';
function innerFunction() {
console.log(variableInParentFunction);
}
return innerFunction;
}
const innerFunctionReference = outerFunction();
innerFunctionReference(); // Logs 'Value'
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Find a path to becoming a Closure. Learn more at:
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Reading list
We've selected 12 books
that we think will supplement your
learning. Use these to
develop background knowledge, enrich your coursework, and gain a
deeper understanding of the topics covered in
Closure.
Provides a comprehensive overview of closures, covering both the theoretical foundations and practical applications.
Focuses specifically on closures in JavaScript, providing a detailed explanation of how they work and how to use them effectively.
Covers closures in JavaScript in depth, including advanced topics such as scope chains and the 'this' keyword.
Introduces functional programming in JavaScript, covering closures and other related topics.
Provides a practical guide to writing good JavaScript code, including a chapter on closures.
Presents a collection of JavaScript design patterns, including several that involve closures.
Provides a comprehensive introduction to JavaScript, including a chapter on closures and scope.
Presents a collection of practical tips and techniques for writing effective JavaScript code, including a chapter on closures.
Provides a concise introduction to closures, covering the basics of how they work and how to use them.
Provides a comprehensive overview of closures in Ruby, covering both the theoretical foundations and practical applications.
Provides a comprehensive overview of closures in Scala, covering both the theoretical foundations and practical applications.
Provides a detailed explanation of closures in Haskell, covering both the basics and more advanced topics.
For more information about how these books relate to this course, visit:
OpenCourser.com/topic/ep0pu7/closur
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