CODEWITHSUNDEEP
javascriptgoogle-chromegoogle-chrome-devtools
Marcin Wisnicki
Marcin Wisnicki

Reputation: 4701

Break into chrome debugger when console.assert fails

How can I cause a break when console.assert() fails (other than replacing assert function with my own and setting breakpoint there) ?

Upvotes: 7

Views: 2161

Answers (2)

Stephan Branczyk
Stephan Branczyk

Reputation: 9375

When you first fire up the Chrome Developer Tool

Click on the pause icon that says on mouseover "Do not pause on exceptions. Click to pause on all exceptions" at the very bottom bar of the Chrome Developer Tool near the left side. If you can not find that icon, press the Sources tab within the Chrome Developer Tool.

That icon should turn blue. If it doesn't turn blue the first time, click on it a second time. Then, it will pause even on console.assert(false);

Upvotes: 6

peterflynn
peterflynn

Reputation: 4896

I don't know of any way to break automatically on failed assert()s, at least in Chrome/Safari.

But I think replacing with your own is actually almost as good:

var nativeAssert = console.assert;
function assertWrapper(expr) {
    nativeAssert.apply(this, arguments);
    if (!expr) {
        "";
    }
}
console.assert = assertWrapper;

Then you can just place a breakpoint on the "" line to catch all failures, while still getting the standard console output you expect.

Upvotes: 1

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