CONDITIONS AND LOOPS

Logical operators can also be used in conditional statements. The logical operators return a Boolean value -- in other words, true or false. The logical operators are shown in the following table.

Using logical operators, you can combine conditions in an if statement; for example:

if (fName == "Fred" && lName == "Astaire") { 
tName = fName + " " + lName; 
alert("Welcome, " + tName); 
}

This if statement tests both the first condition and the second condition, and executes the code block if both conditions are true.