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The default settings make it much easier to work with functions. Using the default settings, you can tell your functions which settings to use in case you haven’t specified. This helps avoid errors and makes the code more readable.
JavaScript introduces default settings in ES2015. These allow you to initialize a function with default values.
In this guide, we’ll talk about what the default settings are, how you can use them, and what types of expressions you can specify as the default setting. We’re going to go through a few examples so that you have all the code you need to get started.
Parameters vs. arguments: the battle
Before we begin, let’s answer an age-old question from beginners: what is the difference between a parameter and an argument? You should know the difference before you start working with presets in JavaScript.
A parameter is a named variable that you pass to a JavaScript function. A parameter is never assigned a direct value. There is a placeholder for a value that you will pass to a function. Here is an example parameter:
In this example, "name" is our parameter. It has no value assigned.
Arguments, on the other hand, are values ​​that are passed to a function:.
Our code returns: "Hello, Brett". "Brett" is an example of an argument, which was the value we were passing through our function