I understand why we need a module and just why encapsulation is needed. However, I can’t understand what its syntax is (function(){ код })() .
Where do brackets come from and what do brackets do around the function
Why and how do we call an anonymous function (as I understand it is exactly what the parentheses do right after {})?
Why when creating libraries (for example for jQuery) we write (function(){ код })(jQuery) ?
A similar question was asked earlier and an answer has already been received. If the answers provided are not exhaustive, please ask a new question .
IIFE can be called in different ways.
It so happened that usually IIFE is wrapped in brackets; this is necessary in order to make the parser explicitly aware that there will be an expression, not a function declaration.
Otherwise, upon encountering function , the declaration will start parsing:
(function () { /* ... */ })(); (function () { /* ... */ }()); (() => { /* ... */ })(); // В стрелочных функциях скобки разрешены только снаружи Although brackets are optional, these options also work:
!function () { /* ... */ }(); ~function () { /* ... */ }(); -function () { /* ... */ }(); +function () { /* ... */ }(); void function () { /* ... */ }(); If it is clear from the context that there should be an expression here, it is no longer necessary to clearly indicate:
var f = function () { /* ... */ }(); true && function () { /* ... */ }(); 0, function () { /* ... */ }(); Source: https://ru.stackoverflow.com/questions/826584/
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