Instructions: Copy the function you created for the second test and name it introductionWithLanguageOptional. It should have two parameters, name and language, and the second parameter should have a ...

The foo function uses strict equality, correctly identifying null input and returning null. The bar function uses loose equality, resulting in unexpected behavior when one parameter is null; in this ...

Passing Multiple Parameters In all these examples I've been passing only a single parameter to my functions and methods. However, it is possible to pass multiple parameters. When passing parameters ...

If you write JavaScript, you have probably used higher-order functions and not even noticed. If you have ever replaced a for loop with an array method, you’ve used higher-order functions.