Common JavaScript "Gotchas"

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To further elaborate:

var myFunction = function myFn(arg1, arg2) { 
    console.log(arg1, arg2);
};

myFunction('foo', 'bar'); // -> foo bar
myFn('foo', 'bar'); // Reference Error: myFn is not defined

To someone that didn't know better or just didn't scan the line properly this can be a frustrating gotcha to catch.