Talk:Core JavaScript 1.5 Guide:Exception Handling Statements:try...catch Statement

From MDC

I was developing a portion of javascript code using multiple catch statements similar to the example:

try {
    throw 'error';
} catch (e if (e == 'error')) {
    // do something
} catch (e) {
    // catch all
}

This code works perfectly fine using SpiderMonkey but does not work in JScript, I considered that the JScript developers had not followed ECMAScript specifications so I checked into it and it turns out that multiple conditional catch blocks are not defined in the specification. The correct ECMAScript compliant code would be:

try {
    throw 'error';
} catch (e) {
    if (e == 'error') {
        // do something
    } else {
        // catch all
    }
}

Perhaps a note or distinction should be made that the multiple catch block definition is an extension to ECMAScript and the alternative or compliant version be provided to help with compatibility.

This is mentioned in the Reference, but please feel free to add it to this page too. Thanks. --Nickolay 12:57, 30 June 2006 (PDT)