3_variables

dz / mdn / js / 0_javascript_first_steps / 3_variables

Summary

Variables

Node Tree

• constants
  • constant_objects_updatable
• variables
  • container_for_value
  • declaring
    • let
      • cant_redeclare
      • var
        • hoisting
        • older
  • dynamic_typing
    • type_specification_unneeded
  • initializing
  • let
    • cant_redeclare
    • var
      • hoisting
      • older
  • var
    • hoisting
    • older
  • variable_types
    • arrays
    • boolean
    • numbers
    • objects
      • constant_objects_updatable
    • strings
    • structure_models_real_life

Nodes

variables
content	Variables
children	container_for_value (description), declaring, dynamic_typing, initializing, let, var, variable_types

declaring
content	Declaring
children	let
parents	variables

container_for_value
content	Container for value
parents	variables

let
content	let
children	cant_redeclare, var ("let" is more modern than "var")
parents	declaring, variables

var
content	var
children	hoisting, older
parents	let, variables

initializing
content	initializing
parents	variables

cant_redeclare
content	Can't redeclare
parents	let

older
content	Older, confusing, error-prone
parents	var

hoisting
content	hoisting
parents	var

variable_types
content	Variable Types
children	arrays, boolean, numbers, objects, strings, structure_models_real_life
parents	variables

strings
content	Strings
parents	variable_types

numbers
content	Numbers
parents	variable_types

arrays
content	Arrays
parents	variable_types

boolean
content	Boolean
parents	variable_types

objects
content	objects
children	constant_objects_updatable
parents	variable_types

structure_models_real_life
content	Structure of code that models a real-life object
parents	variable_types

dynamic_typing
content	Dynamic Typing
children	type_specification_unneeded (description)
parents	variables

type_specification_unneeded
content	No need to specify what data type a variable will contain
parents	dynamic_typing

constants
content	constants
children	constant_objects_updatable

constant_objects_updatable
content	Can update constant objects because pointer is the the same
parents	objects, constants