jquery – Return a variable from a Javascript function

How can I access the value of imgWidth? This is giving me undefined.

somejQueryMethod(function() { 
    var imgWidth;
    $(\"<img/>\").attr(
        \"src\", 
        $(\"#SomeImgSelector\").attr(\"src\")
    ).load(function() {
        imgWidth = this.width;
    });
    // use imgWidth here
});

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