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The Conditional Operator

The Java Script Conditional Operator uses a question mark (?) and a colon (:) as a short-cut way to create an if⁄else statement.

condition ? expression1 : expression2

If condition evaluates to true, the ? operator returns expression1. If condition evaluates to false, the ? operator returns expression2. The example code below might be a test to see if you're paying too much for cable television.

<script type="text/javascript">
var price = 65.00;
var result = price > 50.00 ? "price too high" : "price good value";
alert(result);
</script>

The condition here is price > 50.00. If the price is greater-than 50.00, the ? operator returns the first string "price too high". If the price is NOT greater-than 50.00, the ? operator returns the second string "price good value".

The example code below might be used to determine shipping charges on an order.

<script type="text/javascript">
var order = 99.00;
var total = order >= 100.00 ? order : order + 10.00;
alert(total);
</script>

The condition here is order >= 100.00. If the order is equal-to or greater-than 100.00, the ? operator returns the first expression. In other words the shipping is free. If the order is NOT equal-to or greater-than 100.00, the ? operator returns the second expression, which adds 10.00 to the total. In this example, the poor fool made an order for just below where he could have got free shipping.

The conditional statement above could be replaced with the if⁄else statement shown below.

<script type="text/javascript">

if(order >= 100.00)
{
  total = order;
}
else
{
  total = order + 10.00;
}
</script>

Some programmers prefer to use the confusing conditional Operator rather than the simple if⁄else statement either because it uses less code or because they think they're super-duper programmers. Well, since the if⁄else statement can also be coded in one line as shown below, I would say the latter is true.

if(order >= 100.00) total = order; else total = order + 10.00;

More Java Script Code:
• JavaScript Character Escape Sequences
• Search and Replace Strings
• Interactively Set Webpage Colors
• The Conditional Operator
• Get Webpage File Date and File Size
• Java Script prompt Message Box
• The continue Statement
• Format a Number as Currency
• Java Script Arithmetic Operators
• Extract Part of a String

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