Web Reference: $ = function() { alert('I am in the $ function'); } JQuery is a very famous JavaScript library and they have decided to put their entire framework inside a function named jQuery. To make it easier for people to use the framework and reduce typing the whole word jQuery every single time they want to call the function, they have also created an alias for it. That alias is $. Therefore $ is the ... What these functions do is that when the function is defined, The function is immediately called, which saves time and extra lines of code (as compared to calling it on a seperate line). Mar 15, 2023 · (function(){})(); Lastly, ! makes the expression return a boolean based on the return value of the function. Usually, an immediately invoked function expression (IIFE) doesn’t explicitly return anything, so its return value will be undefined, which leaves us with !undefined which is true. This boolean isn’t used.
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