reading-notes

My reading notes

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Java Script

JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.

What are Variables?

• Variables are containers for storing data (storing data values)
• 4 ways to declare a variable
  1. Using var
  2. Using let
  3. Using const
  4. Using nothing
• When to use var in JS?
  • var keyword has been used in all of JS code from 1995 to 2015. The let and const keywords were added in 2015. If you want your code to run in older browsers, you must use var
• When to use const in JS?
  • as a general rule always declare variables with with const. If you think the value of the variable can change use let.