| 2. 6. 5. || (Logical OR) |
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The logical OR operator in JavaScript is the same as in Java, using the double pipe (||): |
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var bTrue = true;
var bFalse = false;
var bResult = bTrue || bFalse;
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Logical OR behaves as described in the following truth table: |
| Operand 1 | Operand 2 | Result | | true | true | true | | true | false | true | | false | true | true | | false | false | false |
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Just like logical AND, if either operand is not a Boolean, logical OR will not always return a Boolean value: |
If one operand is an object and one is a Boolean, the object is returned. |
If both operands are objects, the first operand is returned. |
If both operands are null, null is returned. |
If either operand is NaN, NaN is returned. |
If either operand is undefined, an error occurs. |
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<html>
<script language="JavaScript">
<!--
x = 8;
if((8==x) || (x=7))
{
document.write("The || evaluated TRUE!<br>");
}
else
{
document.write("The || evaluated FALSE!<br>");
}
document.write("x=",x,"<br>");
-->
</script>
</html>
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