Variables can be declared with the 'var', 'let' or 'const' keyword.
Variables do not have an explicit data type. There are 3 primitive data types.
Variables do not have a data type until a value is assigned to it and at that point the correct data type is inferred.
The semicolon is optional when statements are followed by a line break.
var myNumber1 = 10; // number data type
var myNumber2 = 5.38; // number data type
var myString = "text"; // string data type
var myBoolean = false; // boolean data type
var varData = data;
var varName = "Smith";
var varAge = 26;
var isOdd = false;
var1 = 10;
In a strongly typed programming language you must declare your variables before using them AND also declare the data type of each variable.
There is an option called Strict Mode that can force you to explicitly declare a variable before it can be used.
let var1 = 10;
This is similar to Option Explicit found in VBA.
All On One Line
The semicolon is required when you have two or more statements on the same line.
This line creates 3 variables and assigns them values
var myObject = new Object(); myString = 'sometext'; myNumber = math.random();
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