Web Front-endJS TutorialHow do I create a function that calls each provided function using JavaScript?
In JavaScript, functions are first-class objects, which means they can be passed as arguments to other functions. This is a powerful feature that can be used to create some interesting patterns.
One such pattern is the "invoke-each" pattern, where a function is created that calls each provided function with the arguments it receives.
Why use Invoke-Each mode?
There are several reasons why you might want to use the invoke-each pattern.
First, it can be used as a way to abstract away the details of how a set of functions are called. This is helpful if the function is called in a complex or repetitive way.
Second, it can be used to create some kind of "pipeline" where the output of each function is passed as input to the next function in the chain. This is a convenient way to string together a series of actions.
Finally, it can be used to create a "tee" function that calls multiple functions with the same parameters and collects the results. This is useful for logging, debugging, or other purposes.
How to implement the Invoke-Each pattern?
There are several different ways to implement calling each pattern.
The most straightforward approach is to simply loop through the provided functions and call each function with the arguments -
function invokeEach(functions, args) {
for (var i = 0; i < functions.length; i++) {
functions[i].apply(null, args);
}
}
In the above code, we loop through the functions and call each function using the Function.prototype.apply() method. This method allows us to call a function with a specific this value and parameter array.
We use the apply() method here because this is a convenient way to pass parameters as an array. You can also use the Function.prototype.call() method, which allows you to pass parameters as separate values.
Example
Below is a complete working code example.
<!doctype html>
<html>
<head>
<title>Examples</title>
</head>
<body>
<div id="result"></div>
<div id="result1"></div>
<div id="result2"></div>
<div id="result3"></div>
<script>
function foo(x) {
document.getElementById("result").innerHTML = 'foo: ' + x;
}
function bar(x) {
document.getElementById("result1").innerHTML = 'bar: ' + x;
}
function baz(x) {
document.getElementById("result2").innerHTML = 'baz: ' + x;
}
function qux(x) {
document.getElementById("result3").innerHTML ='qux: ' + x;
}
function invokeEach(functions, args) {
for (var i = 0; i < functions.length; i++) {
functions[i].apply(null, args);
}
}
invokeEach([foo, bar, baz, qux], [5]);
</script>
</body>
</html>
As you can see, the code example above defines four functions: foo(), bar(), baz(), and qux(). These functions simply print out a message using the provided parameters.
Next, we define the invokeEach() function, which accepts a function array and a parameter array. This function loops through the provided functions and calls each function with the provided arguments.
Finally, we call the invokeEach() function, passing in four functions and a single parameter 5. As expected, this results in every function being called with argument 5.
In this tutorial, we looked at the invoke-each pattern in JavaScript. This pattern can be used to create a function that calls each provided function with the arguments it receives.
We learned how to implement this pattern and some of the reasons why you might want to use it.
The above is the detailed content of How do I create a function that calls each provided function using JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
Replace String Characters in JavaScriptMar 11, 2025 am 12:07 AMDetailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi
8 Stunning jQuery Page Layout PluginsMar 06, 2025 am 12:48 AMLeverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation
Build Your Own AJAX Web ApplicationsMar 09, 2025 am 12:11 AMSo here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J
How do I create and publish my own JavaScript libraries?Mar 18, 2025 pm 03:12 PMArticle discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.
Load Box Content Dynamically using AJAXMar 06, 2025 am 01:07 AMThis tutorial demonstrates creating dynamic page boxes loaded via AJAX, enabling instant refresh without full page reloads. It leverages jQuery and JavaScript. Think of it as a custom Facebook-style content box loader. Key Concepts: AJAX and jQuery
10 jQuery Fun and Games PluginsMar 08, 2025 am 12:42 AM10 fun jQuery game plugins to make your website more attractive and enhance user stickiness! While Flash is still the best software for developing casual web games, jQuery can also create surprising effects, and while not comparable to pure action Flash games, in some cases you can also have unexpected fun in your browser. jQuery tic toe game The "Hello world" of game programming now has a jQuery version. Source code jQuery Crazy Word Composition Game This is a fill-in-the-blank game, and it can produce some weird results due to not knowing the context of the word. Source code jQuery mine sweeping game
How to Write a Cookie-less Session Library for JavaScriptMar 06, 2025 am 01:18 AMThis JavaScript library leverages the window.name property to manage session data without relying on cookies. It offers a robust solution for storing and retrieving session variables across browsers. The library provides three core methods: Session
jQuery Parallax Tutorial - Animated Header BackgroundMar 08, 2025 am 12:39 AMThis tutorial demonstrates how to create a captivating parallax background effect using jQuery. We'll build a header banner with layered images that create a stunning visual depth. The updated plugin works with jQuery 1.6.4 and later. Download the
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
Dreamweaver CS6
Visual web development tools
SublimeText3 Linux new version
SublimeText3 Linux latest version
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
