Variables

20 lessons

• 01Learn JavaScriptAn introduction to JavaScript, the world's most widely-used programming language.
• 02Basic VariablesLearn how to declare basic variables in JavaScript using the legacy `var` keyword and understand common data types.
• 03let and constTransition from `var` to the modern, block-scoped variable declarations using `let` and `const`.
• 04Why JavaScript?Understand the unique position JavaScript holds in the web development ecosystem and its pros and cons.
• 05CommentsLearn how to annotate your JavaScript code using single-line and multi-line comments.
• 06Numbers in JSUnderstand how JavaScript handles numbers, including integers and floating-point values, as a single `Number` type.
• 07Numbers ReviewA quick review of basic mathematical operations using JavaScript's unified `Number` type.
• 08Increment and DecrementLearn shorthand operators for increasing and decreasing numeric values in JavaScript.
• 09Undefined vs. UndeclaredUnderstand the critical difference between a variable that is explicitly undefined and one that has never been declared.
• 10Null vs. UndefinedExplore the subtle differences between `null` and `undefined`, JavaScript's two unique ways of representing nothingness.
• 11Dynamic and Weak TypingDiscover how JavaScript's dynamic and weakly-typed nature allows for flexibility, while also introducing potential type coercion bugs.
• 12Same Line DeclarationsLearn how to declare and initialize multiple variables on a single line to keep your code concise.
• 13JavaScript's SpeedAn overview of how JavaScript's execution speed compares to other languages through Just-In-Time (JIT) compilation.
• 14StringsLearn how to define text data using strings, access individual characters, and determine string length.
• 15Template LiteralsUtilize template literals for advanced string formatting and executing inline JavaScript logic.
• 16Java vs. JavaScriptDispel the common misconception that Java and JavaScript are related languages.
• 17Semi-Colons in JSUnderstand the role of semicolons as statement terminators in JavaScript and best practices for using them.
• 18String EncodingLearn how JavaScript encodes strings using UTF-16 code units and how this impacts string length, especially with emojis.
• 19Camel Case in JSAdopt `camelCase` as the standard naming convention for variables and functions in JavaScript.
• 20Chapter 1 Cheatsheet: Variables & BasicsA quick summary and cheatsheet of all the essential JavaScript variable and syntax concepts covered in Chapter 1.