How do you check if a selector matches something in jQuery? [duplicate]

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As the other commenters are suggesting the most efficient way to do it seems to be: 

if ($(selector).length ) {
    // Do something
}

If you absolutely must have an exists() function – which will be slower- you can do:

jQuery.fn.exists = function(){return this.length>0;}

Then in your code you can use

if ($(selector).exists()) {
    // Do something
}

As answered here

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