CODEWITHSUNDEEP
javascriptclosures
Игор Ташевски
Игор Ташевски

Reputation: 671

js closures, get function parameters from global context

If i have a closure like the code below, how I can get the 'a' parameter outside the closure. JS engine use scope chain to get to find the value of 'a' when I call the closure, but is there some chance to get the 'a' value from global context?

function fn(a){
    return function f(b){
        console.log(a + " " + b);
    }
}

BR, Igor

Upvotes: 0

Views: 30

Answers (2)

Samraj07 cht
Samraj07 cht

Reputation: 1

var count=0;
function add(){
return count+=1;
}
function sub(){
return count-=1;
}
function increment(){
document.getElementById("element").innerHTML=add();
}
function decrement(){
document.getElementById("element").innerHTML=sub();
}
<button type="button" onclick="increment()">Increment!!</button>
<button type="button" onclick="decrement()">Decrement!!</button><br><br><br>
<div id="element"><div>

Upvotes: 0

Jonas Wilms
Jonas Wilms

Reputation: 138257

Some trick would be assigning it to the function object:

function fn(a){
  function f(b){
    console.log(a + " " + b);
  }
  f.a = a;
  return f;
}

So you can do:

const result = fn(2);
console.log(result.a, result(2));

However a closure is there to encapsulate things. If you don't want that, you should not use a closure.

Upvotes: 1

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