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Learn JavaScript Variables and Constants. The Complete Guide: Thread 🧵


So I learned something new yesterday... you can create variables in CSS! can you believe that?!?!


"One person's constant is another person's variable." — Susan Gerhart


WHAT ARE VARIABLES? 🤔 Labels you put on pieces of information! When that value can't change, JavaScript calls it a "constant" and we say it is "immutable". You can reuse variables in your code wherever you need that information! ▶ Video version: youtube.com/watch?v=y9PscU…

AnnaJMcDougall's tweet image. WHAT ARE VARIABLES? 🤔

Labels you put on pieces of information! 

When that value can't change, JavaScript calls it a "constant" and we say it is "immutable". 

You can reuse variables in your code wherever you need that information!

▶ Video version: youtube.com/watch?v=y9PscU…

Wow I just learned in VS code you don't need to type var(-- to see your CSS variables, just -- and it will wrap it in var().

wesbos's tweet image. Wow I just learned in VS code you don't need to type var(-- to see your CSS variables, just -- and it will wrap it in var().

18 years of .NET development and I had no idea you could do this: proj file: <DefineConstants>$(MyVariable)</DefineConstants> code: #if FOO Console.WriteLine("Hello I'm Foo!"); #endif dotnet build :p/MyVariable=FOO


1. Variables + Scoping. This is a fantastic article by @codebeast on variables followed by another lesson on scope. scotch.io/courses/10-nee…


Today I published 'JavaScript Variables Explained. Var, Let and Const with examples' Like many other programming languages, JavaScript has variables. I talk you through var, let and const, and how they differ from each other with examples > youtu.be/J0y6XXdm4KI #100DaysOfCode

ania_kubow's tweet image. Today I published &apos;JavaScript Variables Explained. Var, Let and Const with examples&apos; Like many other programming languages, JavaScript has variables. I talk you through var, let and const, and how they differ from each other with examples &amp;gt; youtu.be/J0y6XXdm4KI  #100DaysOfCode

In JavaScript we've largely eschewed `var` in favor of `let` or `const`, and do-while loops in favor of for or while loops... but I just discovered that using `var` and do-while loops together can result in some pretty nice code (IMO): Good idea? Bad idea?

DavidKPiano's tweet image. In JavaScript we&apos;ve largely eschewed `var` in favor of `let` or `const`, and do-while loops in favor of for or while loops... but I just discovered that using `var` and do-while loops together can result in some pretty nice code (IMO):

Good idea? Bad idea?

"One person's constant is another person's variable."- Susan Gerhart


"One person's constant is another person's variable." - Susan Gerhart


"One person's constant is another person's variable."- Susan Gerhart


"One person's constant is another person's variable." - Susan Gerhart


"One person's constant is another person's variable." - Susan Gerhart


--variables should be pretty useful for simple, customizable, flexbox-based grid systems codepen.io/pixelass/post/…

css's tweet image. --variables should be pretty useful for simple, customizable, flexbox-based grid systems codepen.io/pixelass/post/…

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