Using Array#every and Array#some to test array values

Sometimes, we need to know information about the array as a whole rather than individual elements, such as "Are there any elements that meet some criterion?" or "Do all the elements meet some criterion?".

In this recipe, we'll take a look at how to use the some and every methods to test an array.

Getting ready

This recipe assumes that you already have a workspace that allows you to create and run ES modules in your browser. If you don't, refer to the first two chapters.

How to do it...

1. Open your command-line application, and navigate to your workspace.
2. Create a new folder named 10-03-using-every-and-some-to-test-values.

3. Create a main.js file that defines a new class named Rocket that takes a constructor argument name and assigns it to an instance property:

// main.js 
class Rocket { 
  constructor(name) { 
    this.name = name; 
  } 
   } 

4. Create a main function that creates several Rocket instances and places them into an array:

// main.js 
export...