Debugging JavaScript with Chrome
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Slides from my lightning talk at Frontend Dev Conf '14. Wrap-up of dev tools for debugging provided by Google Chrome, including a few non-documented, but very handy ones.
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![Console API: table()
var people = [
{
name: 'Hopper', surname: 'Herring'
}, {
name: 'Sampson', surname: 'Douglas'
}, {
name: 'Carmella', surname: 'Vincent'
}
];
console.table(people);
console.table(
document.querySelectorAll('a'),
['href', 'text']
);](https://image.slidesharecdn.com/debuggingjswithchrome-140420103024-phpapp01/85/Debugging-JavaScript-with-Chrome-6-320.jpg)
![Digging out Command Line API
(function() {
debugger;
})();
var members = Object.keys(__commandLineAPI)
.filter(function(key) {
return ! (key in console);
}).reduce(function(obj, key) {
obj[key] = __commandLineAPI[key];
return obj;
}, {});
console.dir(members);](https://image.slidesharecdn.com/debuggingjswithchrome-140420103024-phpapp01/85/Debugging-JavaScript-with-Chrome-8-320.jpg)
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- 1. Debugging JS with Chrome >The little power tools Igor Zalutsky
- 2. Async call stacks setTimeout(function () { $.ajax({ url: 'http://echo.jsontest.com/foo/bar' }).done(function(response) { debugger; }); }, 500);
- 3. Console API: the basics var obj = { prop: 1, child: { prop: 2 } }; console.log(obj); console.log('%On%o', document.body, document.body); console.warn('something unexpected happened'); console.error('something went wrong'); console.assert("str" instanceof String, 'gotcha!');
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- 8. Digging out Command Line API (function() { debugger; })(); var members = Object.keys(__commandLineAPI) .filter(function(key) { return ! (key in console); }).reduce(function(obj, key) { obj[key] = __commandLineAPI[key]; return obj; }, {}); console.dir(members);
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- 14. Thanks! Useful links > Google Chrome Console API docs > Google Chrome Command Line API docs > “Lesser-Known JavaScript Debugging Techniques” by Amjad Masad > “Advanced JavaScript Debugging with console.table()” by Marius Schulz Follow me! @igorzij github.com/zij linkedin.com/in/izalutsky