Conditional catch clauses - browsers support

Question

What browsers support Conditional catch clauses?

On MDN try...catch you can find Conditional catch clauses as Non-standard feature.

try {
    myroutine(); // may throw three exceptions
} catch (e if e instanceof TypeError) {
    // statements to handle TypeError exceptions
} catch (e if e instanceof RangeError) {
    // statements to handle RangeError exceptions
} catch (e if e instanceof EvalError) {
    // statements to handle EvalError exceptions
} catch (e) {
    // statements to handle any unspecified exceptions
    logMyErrors(e); // pass exception object to error handler
}

Note: This functionality is not part of the ECMAScript specification.

It's supported by any modern browsers?

Google Chrome's console returned Uncaught SyntaxError: Unexpected token if

Or shoud I use:

try {
    myroutine(); // may throw three exceptions
} catch (e) {
    if(e instanceof TypeError) {
        // statements to handle TypeError exceptions
    }
    else if(e instanceof RangeError) {
        // statements to handle RangeError exceptions
    }
    else if(e instanceof EvalError) {
        // statements to handle EvalError exceptions
    }
    else {
        // statements to handle any unspecified exceptions
        logMyErrors(e); // pass exception object to error handler
    }
}

Answer 1

You should use the later one, as it works everywhere, quoting MDN

And here is how to do implement the same "Conditional catch clauses" using only simple JavaScript conforming to the ECMAScript specification (obviously it's more verbose, but works everywhere (I have tested on Firefox, IE and Chrome)), I have :

try {
    myroutine(); // may throw three types of exceptions
} catch (e) {
    if (e instanceof TypeError) {
        // statements to handle TypeError exceptions
    } else if (e instanceof RangeError) {
        // statements to handle RangeError exceptions
    } else if (e instanceof EvalError) {
        // statements to handle EvalError exceptions
    } else {
       // statements to handle any unspecified exceptions
       logMyErrors(e); // pass exception object to error handler
    }
}

The first one catch (e if e instanceof ..) only works with Mozilla Firefox and gives errors on chrome and IE

Chrome

Uncaught SyntaxError: Unexpected token if

IE

SCRIPT1006: Expected ')'

Answer 2

On MDN try...catch you can find Conditional catch clauses as Non-standard feature.  

Note: This functionality is not part of the ECMAScript specification.

What this means is that this is not part of the javascript language that all browsers and stuff have agreed upon having available. Which most certainly will mean that not all browsers will support it if any. Your best option regarding a cross-browser solution would be the second case using a switch clause. GL