Beginners Guide to JavaScript Variables

In JavaScript, a variable is a container that holds a value.

Variables are declared using the keyword "var", "let" or "const" and are assigned a value using the assignment operator (=).

The value stored in a variable can be of any data type, such as a string, number, or boolean. Variables can be used to store and manipulate data in a program.

In JavaScript, "var", "let", and "const" are used to declare variables.

• var is used to declare a variable that is accessible within the entire scope of the current function or script. Variables declared with var can be reassigned new values or re-declared in the same scope without throwing an error.

• let is used to declare a variable that is block-scoped, meaning it is only accessible within the block in which it was declared. Variables declared with let can be reassigned new values but cannot be re-declared in the same scope without throwing an error.

• const is used to declare a variable that is block-scoped and cannot be reassigned new values or re-declared in the same scope without throwing an error. A constant variable must be initialized with a value when it is declared.

In practice, let and const are recommended over var, as they give you more control over the scope and readability of your code.

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