lecture-4-variables.md

2.1.4 JavaScript Variables (bindings)

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• Variables are used to hold data values.
• Variables are essentially data containers.
• They can also hold functions
• There are 3 ways to declare variables.

var name = 'Rick';
const profession = 'Scientist';
let grandson = 'Morty';

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Defining variables

• Never use var. It really should be deprecated...
• Use either const or let
  • const for variables that will never change
  • let for variables that may change

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Naming conventions

• Can be just about anything.
• Cannot contain spaces.
• Can contain numbers but cannot start with a number.

// Example

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Camel Case, dashes, and underscores

For clarity, we often want to name variables with multi-word expressions.

There are many ways to do this.

• Camel Case
  • ``
• Dashes
  • ``
• Underscores
  • ``

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In the course, we will be using camelCase.

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Reserved words

These words cannot be used as variable names. JavaScript reserves them for its own internal use.

break case catch class const continue debugger default
delete do else enum export extends false finally for
function if implements import interface in instanceof let
new package private protected public return static super
switch this throw true try typeof var void while with yield

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