In this JavaScript ES6 tips and walkthrough we take a look at How to Add Default Parameters in JavaScript ES6, Codecademy Programming, Default Parameters ES6 Tips. This is from Codecademy’s JavaScript course, in the Functions section. The lesson is called Default Parameters and it teaches us how to set up default parameters in our JavaScript functions. To add default parameters in JavaScript functions, you assign the values of your parameters, similar to how you create a variable in JavaScript. Default Parameters is an ES6 feature and it allows us to give our function a default value in case no arguments are passed in when the function is run. Learning that you are able to set default values for your functions is a relief since there can be real-world cases in which your function is not passed in the arguments your function requires. Being able to assign values to your default parameters is important knowledge to have when learning to program in JavaScript.
In this tutorial, we explore the topic of How to Add Default Parameters in JavaScript ES6, provided by Codecademy’s JavaScript course. This is an important feature to learn about in the Functions section as it allows us to set up default values for parameters in our JavaScript functions. The lesson covers ES6 tips for default parameters, showing how to assign the values of our parameters similarly to how we create a variable in JavaScript.
When setting default parameters, it is important to note that they will only be used if no arguments are passed in when the function is called. Otherwise, the arguments passed in will override the default values. This feature can be especially useful in real-world scenarios where a function may not receive all the arguments it needs to run properly. By setting default values for the parameters, we can ensure that our function still executes correctly.
We learn how to create a function with default parameters using a simple example called “sayGreeting”. In this example, the function has a single parameter called “name” and a default parameter called “greeting” which is set to “Hello”. This means that if no greeting is passed in when the function is called, it will default to “Hello”. However, if a greeting is passed in, it will override the default value.
To call a function with default parameters, we simply pass in the values for any parameters we want to use, and leave the default ones empty if we want to use the default value. The lesson explains how to properly provide arguments to a function with default parameters, so make sure to understand this before moving on to the next lessons.
Overall, understanding how to add default parameters in JavaScript ES6 is an important concept for any JavaScript programmer to learn. This feature allows us to set default values for our functions and ensures that our code is more robust and error-free. So take the time to study this lesson and practice using default parameters in your own JavaScript code.