How to check if JQuery library is loaded?

Question: How to check if JQuery library is loaded?

Answer:

Use the following code withing your JavaScript tags

 
if(jQuery){  
    alert('jQuery loaded');  
}else{
    alert('jQuery not loaded');
} 
 

This method can be used to check if any other JavaScript variable or function exists or is set and thus is not limited to jQuery alone. 

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