"!" and "?" in Ruby Methods

Jazmine — Tue, 18 Jul 2023 20:01:43 +0000

Thanks to a meeting with a student, I learned about some neat ways Ruby improves the readability of its code!

Ruby methods ending with ! indicates that it will modify the object it's acting on.

For example, using the reverse method will return the array with the items in the reversed order. When you call the array again, it will return as it originally was.

a = ["red", "yellow", "blue", "pink"]
a.reverse 
# => ["pink", "blue", "yellow", "red"]

a = ["red", "yellow", "blue", "pink"]

However, when you add the ! to the end of the method, it will overwrite it, and modify the array!

a = ["red", "yellow", "blue", "pink"]
a.reverse!
# => ["pink", "blue", "yellow", "red"]

a = ["pink", "blue", "yellow", "red"]

Ruby methods ending with ? indicates that it will return a boolean.

4.odd? # => false
5.odd? # => true
6.even? # => true

Today I learned...

Jazmine — Wed, 15 Mar 2023 20:56:16 +0000

We started on HTML and CSS basics this week! We laid out the basics of HTML by creating a simple rock-paper-scissors webpage.

We began by getting acclimated to the very basics of GitPod and VSCode. Our first HTML lesson consisted of learning the syntax.

<a href="https://github.com/">
   Go to GitHub
</a>

The syntax consists of:

The opening tag <a>
The closing tag </a>
The content in between Go to GitHub
Attributes inside the opening tag href=""

And collectively, we call this an element.

Elements can have more than one attribute and contain other elements!
The element inside is called the child element, while the element outside is the parent element.

We also learned the boilerplate of HTML.

<!DOCTYPE html
<html>
   <head>
      <meta charset="utf-8">
      <title>Document</title>
      <meta name="viewport" content="width=device-width">
   </head>
   <body>
      <!-- content to be displayed to the user -->
   </body>
</html>

Now more on attributes, some only make sense in specific elements. Examples include:

href="" is for <a> elements and specifies where to take the user when they click on the link.
src="" is for <img> elements and specifies the url of the image to load.
for="" is for <label> elements and specifies which input element it is paired with.

DEV Community: Jazmine

"!" and "?" in Ruby Methods

Today I learned...