In Swift, Constants and variables must be defined prior to using them.
Variable
A variable’s value can be updated to a new value.
To define a variable, use the “var” keyword.
For example,
var num1 = 10 num1 = 20 // no error
Constant
Constant values can be assigned only once.
To define a constant, use the “let” keyword.
let num2 = 10 num2 = 30 // compilation error
Here is a screenshot from Swift Playground for the same :
We can declare multiple constants or variables in a single line by separating them with a comma.
var num1 = 10, num2 = 20 let freezingTempCelcius = 0, freezingTempFarenheit = 32
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