CSS – var() Function
The var() function is used to create a CSS variable and insert the value into a property.
JavaScript – Using Variables
In JavaScript, variables are used to store data that will be used in multiple places. This allows the data to be kept in one place for ease of change.
JavaScript – const Statement
The const statement declares a variable (container for storing information) with an immediately defined value that will not change.
JavaScript – let Statement
The let statement declares a variable (container for storing information), and can be empty when declared, with the value assigned later.
JavaScript – var Statement
The var statement declares a variable (container for storing information), and can be empty when declared, with the value assigned later.
JavaScript – Global undefined Property
The undefined property indicates that a variable has not been assigned a value, or not declared at all.
JavaScript – var vs. let vs. const
In JavaScript, variables can be declared using three different methods: var, let, and const. Here are the differences between them.
PHP – const Keyword
The PHP const keyword is used to create constants, and must be declared in the global scope.
PHP – global Keyword
The PHP global keyword imports variables from the global scope into the local scope of a function.
Python – The Basics of Variables
Variables are containers for storing data values. Python has no command for declaring a variable, instead creating it when you first assign a value to it.
Python – Variable Names
Variables can have a short names (like x and y) or a longer, more descriptive name (like age, firstname, phone_number).
Python – Assigning Multiple Values to Variables
Python allows you to assign values to multiple variables in one line or the same value to multiple variables in one line.
Python – Outputting Variables Using the print() Function
The Python print() function can be used to output the value of variables.
Python – Global Variables and the Global Keyword
Python Global variables can be used both inside and outside of functions. While a variable created inside a function can only be used inside the function.
Python – Extracting Tuple Items to Variables
When creating a Python tuple, items are normally assigned to it (“packing” a tuple). Extracting the items into variables is called “unpacking” the tuple.