Variables

A variable is a named container for a value.

There are three ways to define a variable - var, let, and const. The const keyword is used for constant values that will not change.

Changing the value of a const will produce an error.

TypeScript programs (and most modern JavaScript programs) tend to favor using let and const over var, due to various unintended behaviors that var can cause. For example, var allows a variable to be declared more than once.

Attempting to use let to redeclare a variable of the same name will produce an error.

Questions