Boolean Type of JavaScript Data Type

 
 

 

Today we are talking about a Boolean type in the data type. It returns both the true and false face values. Note that the face values are case sensitive, that is, all except lower-case letters are identifiers.

The following describes various data types and corresponding conversion rules:

Convert data type to true to false

 

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Boolean true false

String any non-empty String "" (empty String)

Number any non-zero numeric values 0 and Nan

Any Object of the Object is null.

Undefined is not applicable to undefined.

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These conversion rules are very important for understanding the process control statements (such as if statements) to automatically execute corresponding Boolean conversions. Please refer to the following code:

Var msg = "Hello World ";
If (msg ){
Alert ("Valus is true ");
}