Default parameters in JavaScript - #42 @Everyday-Be-Coding

In JavaScript, default parameters allow you to specify default values for function parameters. If a parameter is not provided when the function is called or if the provided value is undefined, the default value is used instead. Default parameters were introduced in ECMAScript 2015 (ES6) and provide a convenient way to handle missing values in function calls. Here's how default parameters work:

JavaScript code
function greet(name = 'World') {
}

greet(); // Output: Hello, World!
greet('John'); // Output: Hello, John!
In the above example, the greet function has a default parameter name set to 'World'. When the function is called without providing an argument for name, the default value 'World' is used. However, if an argument is provided, such as 'John', the provided value is used instead of the default.

You can also use expressions as default parameter values:

JavaScript code
function calculateArea(width, height = width * 2) {
return width * height;
}

In this example, the default value of the height parameter is set to width * 2, allowing you to calculate the area of a rectangle with a default aspect ratio of 2:1.

Default parameters are particularly useful for defining functions with optional arguments or for providing sensible fallback values when certain arguments are not provided. They enhance the flexibility and usability of functions in JavaScript.

#JavaScript
#ES6
#DefaultParameters
#Programming
#WebDevelopment
#Coding
#JavaScriptTutorial
#Tech
#Frontend
#CodeTips

JavaScript Default Parameters
Default Parameters Tutorial
ES6 Default Parameters
JavaScript Function Defaults
Default Parameter Values
JavaScript Functions Tutorial
ECMAScript Default Parameters
Modern JavaScript Features
Frontend Development
JavaScript Tips and Tricks

Chapter :
00:00 Default parameters
00:19 Basic example
00:46 Expressions as default parameters
01:41 Summery

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