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closure functions

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Busy Beaver answered on September 25, 2021 Popularity 8/10 Helpfulness 2/10

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closure functions

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var funcs = [];

function createfunc(i) {
  return function() {
    console.log("My value: " + i);
  };
}

for (var i = 0; i < 3; i++) {
  funcs[i] = createfunc(i);
}

for (var j = 0; j < 3; j++) {
  // and now let's run each one to see
  funcs[j]();
}
 Run code snippetHide results

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript

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Contributed on Nov 28 2022

Busy Beaver

0 Answers Avg Quality 2/10

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Closure ()

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// Closures
// In JavaScript, closure is one of the widely discussed and important concepts.
// A closure is a function that has access to the variable from another function’s scope which is accomplished by creating a function inside a function. As defined on MDN:
// “Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created.”
// In JavaScript, closures are created every time a function is created, at function creation time. Most JavaScript developers use closure consciously or unconsciously — but knowing closure provides better control over the code when using them.
// Example:

function Spellname(name) {
var greet = "Hi, " + name + "!";
var sName = function() {
var welc = greet + " Good Morning!";
console.log(greet);
};
return sName;
}
var Myname = SpellName("Nishi");
Myname();  // Hi, Nishi. Good Morning!

// In the above example, the function sName() is closure; it has its own local scope (with variable welc) and also has access to the outer function’s scope. After the execution of Spellname(), the scope will not be destroyed and the function sName() will still have access to it.

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: betterprogramming.pub

Tags: javascript j

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Contributed on Dec 20 2021

Meandering Meerkat

0 Answers Avg Quality 2/10

How do JavaScript closures work?

Comment

/*
A lexical environment is part of every execution context (stack frame) and is a map between identifiers (i.e. local variable names) and values.

Every function in JavaScript maintains a reference to its outer lexical environment. This reference is used to configure the execution context created when a function is invoked. 
This reference enables code inside the function to "see" variables declared outside the function, regardless of when and where the function is called.

If a function was called by a function, which in turn was called by another function, then a chain of references to outer lexical environments is created.
This chain is called the scope chain.

In the following code, inner forms a closure with the lexical environment of the execution context created when foo is invoked, closing over variable secret:
*/
function foo() {
  const secret = Math.trunc(Math.random() * 100)
  return function inner() {
    console.log(`The secret number is ${secret}.`)
  }
}
const f = foo() // `secret` is not directly accessible from outside `foo`
f() // The only way to retrieve `secret`, is to invoke `f`
 Run code snippet

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: closures closure

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Contributed on Jun 22 2022

Sleepy Squirrel

0 Answers Avg Quality 2/10

how javascript closures work?

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function foo() {
  const secret = Math.trunc(Math.random() * 100)
  return function inner() {
    console.log(`The secret number is ${secret}.`)
  }
}
const f = foo() // `secret` is not directly accessible from outside `foo`
f() // The only way to retrieve `secret`, is to invoke `f`
 Run code snippet

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: closures closure

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Contributed on Jun 16 2022

Himanshu Jangid

0 Answers Avg Quality 2/10

Closure Example

Comment

	 function Counter() {
    var counter = 0;
alert("XXXXX");
function increaseCounter()
{
return counter +=1;
} 

return increaseCounter;
}

/***/
const counter = new Counter();
console.log(counter());
console.log(counter());


/*note that alert("XXXX") only executes once*/
/*think of counter() = new Counter() declaration as storing the value of ONE Counter function execution and 
the remaining times you use counter(), you reexecute only the returned function*/
/*use counter() instead of Counter() if you want alert("XXXX") to execute only once AND for you to be able to return an actual value otherwise you only console.log a function and alert executes multiple times*/

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 15 2022

Javasper

0 Answers Avg Quality 2/10

What is Closures in JavaScript

Comments(1)

/*A closure is the combination of a function bundled together (enclosed) with references
to its surrounding state (the lexical environment). In other words, a closure gives you 
access to an outer function’s scope from an inner function. In JavaScript, closures are 
created every time a function is created, at function creation time.*/

function init() {
  var name = 'Mozilla'; // name is a local variable created by init
  function displayName() { // displayName() is the inner function, a closure
    alert(name); // use variable declared in the parent function
  }
  displayName();
}
init();

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: closures closure

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Contributed on Sep 25 2021

Noble@247

0 Answers Avg Quality 2/10

closures

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// Closures
//Almost mystical like feature that many developers fail to fully understand.
//We cannot create closures manually like how we create arrays and functions.
//Rather closures happen in certain  situations. We just need to recognize 
//those situations.

//Example:
const secureBooking = function () {
   let passengerCount = 0; //Variable of the secureBooking Function
   
  //returns a function
   return function () {
     passengerCount++; //Adding to the passengerCount
     console.log(passengerCount);
  };
 };

const book = secureBooking(); //capture that function
book();

//In the above example we have a function called secureBooking
//That function returns another function, which we stored in book variable
//We then call the book() function and it adds to the passengerCount.
//But you may be wondering? How can it add to the passengerCount
//if the secureBooking has finished executing, shouldn't it not exist?
//This works because all functions have access to the variable environment
// in which they were created in. Meaning since secureBooking created
// the function which we stored in book. The book function now has 
// access to the variable environment of secureBooking function.

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: closures javascript javas

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Contributed on Jul 21 2022

OnTheGoCode

0 Answers Avg Quality 2/10

closure examples

Comment

function makeFunc() {
  const name = 'Mozilla';
  function displayName() {
    console.log(name);
  }
  return displayName;
}

const myFunc = makeFunc();
myFunc();

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Sep 12 2022

Average Ape

0 Answers Avg Quality 2/10

what is closure

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outer = function() {
  var a = 1;
  var inner = function() {
    console.log(a);
  }
  return inner; // this returns a function
}

var fnc = outer(); // execute outer to get inner 
fnc();

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jun 12 2022

Pham Thanh

0 Answers Avg Quality 2/10

function - How do JavaScript closures work?

Comment

function createObject() {
  let x = 42;
  return {
    log() { console.log(x) },
    increment() { x++ },
    update(value) { x = value }
  }
}

const o = createObject()
o.increment()
o.log() // 43
o.update(5)
o.log() // 5
const p = createObject()
p.log() // 42

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: worcraft-algeria-dz.com

Tags: closures closure

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Contributed on Jul 28 2022

thecodeteacher

0 Answers Avg Quality 2/10

closure functions

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