jQuery hasAttr checking to see if there is an attribute on an element [duplicate]

How do you check if there is an attribute on an element in jQuery? Similar to hasClass, but with attr?

For example,

if ($(this).hasAttr("name")) {
    // ...
}

var attr = $(this).attr('name');

// For some browsers, `attr` is undefined; for others,
// `attr` is false.  Check for both.
if (typeof attr !== 'undefined' && attr !== false) {
    // ...
}