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@jennazee jennazee/
Last active May 20, 2016

What would you like to do?

I wanted to do not something if the PerformanceTiming object wasn't available, so I started with something like this:

if (!window.performance || !window.performance.timing) {

DeMorgans law says that you can factor out the "not" and then flip the "and" to an "or" or vice versa. So, I was able to switch it to

if (!(window.performance && window.performance.timing)) {
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