JavaScript supports the notion of weak typing.

JavaScript supports the notion of weak typing.

JavaScript supports the notion of weak typing.

 

JavaScript supports the notion of weak typing, or dynamic typing. This means that the type of a variable is inferred from the data it contains. This is why there is only one way to declare variables- by using the

var keyword.

 

 

var v = "Some String Data";

alert(typeof v);

v = 5;

alert(typeof v);

 

 

In above first instance, a message box will be displayed showing that the type of v is a string. In the second

instance, the type of v is a number. The type of the v variable has been inferred, and in fact changed, according to what type of data it contains.