Testing for console.log statements in IE [duplicate]

You don’t have to jump through all these hoops. Simply check if the console exists before using it.

So, instead of:

console.log('foo');

Use:

window.console && console.log('foo');

…and you won’t get any errors.

---

Alternatively, you could just check for it at the top of your script, and if it’s undefined, just fill it with an empty function:

// At the top of your script:
if ( ! window.console ) console = { log: function(){} };
// If you use other console methods, add them to the object literal above

// Then, anywhere in your script:
console.log('This message will be logged, but will not cause an error in IE7');

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For a more robust solution, use this piece of code (taken from twitter’s source code):

// Avoid `console` errors in browsers that lack a console.
(function() {
    var method;
    var noop = function () {};
    var methods = [
        'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',
        'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',
        'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',
        'timeStamp', 'trace', 'warn'
    ];
    var length = methods.length;
    var console = (window.console = window.console || {});

    while (length--) {
        method = methods[length];

        // Only stub undefined methods.
        if (!console[method]) {
            console[method] = noop;
        }
    }
}());