Does A Single function accessing global variable can make closure? [duplicate] - javascript

This question already has answers here:
Is it true that every function in JavaScript is a closure?
(2 answers)
JavaScript closures vs. anonymous functions
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Will a simple function declaration form a closure in JavaScript?
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When closures are created in JavaScript
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Closed 10 months ago.
const a = 'MDNS';
function init() {
console.log(a)
}
init();
Is the above code is a closure?
or Is there any other way we can make closure from single function only.

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In the following code example writes
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How let create a new i in every iteration but only one var i?

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What is the difference between a simple function and a function with this keyword in javascript? [duplicate]

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I have the following code-
var x=function(){
alert("hello");
}
var z=x;
z();// it works nicely
Now say I modified the code a bit-
var x=function(){
this.show=function(){
alert("hello");
}
}
var z=x;// It doesn't work unless I write var z=new x();
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Javascript - what is the purpose of wrapping functions or codes in a function? [duplicate]

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This probably is not a new question, but where is the purpose of wrapping a function or codes inside ((function () {...})());? for instance,
//Self-evoking anonymous functions
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alert("hi");
})());
What's the difference with no wrap,
alert("hi");
I still get the same result - hi
What can you pass/ put in the brackets in the end bit - })());? and why?
Using a function creates a scope. You can have params inside and do more than just alerting.
Now you can do the same without a function, but then you will keep the state on the window object and thats something that you would like to prevent in some cases.

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