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function - How do JavaScript closures work?

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thecodeteacher answered on July 4, 2020 Popularity 10/10 Helpfulness 1/10

answer function - How do JavaScript closures work?

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function - How do JavaScript closures work?

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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 1/10 Language javascript

Source: worcraft-algeria-dz.com

Tags: closures function javascript

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Contributed on Jul 28 2022

thecodeteacher

0 Answers Avg Quality 2/10

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closure in js

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A closure gives you access to an outer function’s scope from an inner function
//example
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 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Nov 07 2020

Joyous Jackal

0 Answers Avg Quality 2/10

closures in javascript

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// A closure is a function having access to the parent scope, 
// even after the parent function has popped.

function greeting() {
    let message = 'Hi';

    function sayHi() {
        console.log(message);
    }

    return sayHi;
}
let hi = greeting();
hi(); // still can access the message variable

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Source: www.javascripttutorial.net

Tags: closures closure

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Contributed on Feb 01 2022

madhav

0 Answers Avg Quality 2/10

closure in javascript

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-->closure in javascript
//closure is the combination of function and the lexical enviornment in
//which the function is defined.closure give you access to the functions
//and variables outside the function.
function outer(){
  const outerData ="outer";
  function inner(){
    const innerData="inner";
    console.log(`${outerData} and{innerData}`);
  }
  inner();
}
outer();

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Dec 22 2021

tokyo

0 Answers Avg Quality 2/10

closure in javascript

Comment

function makeFunc() {
  var name = 'Mozilla';
  function displayName() {
    alert(name);
  }
  return displayName;
}

var myFunc = makeFunc();
myFunc();

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jul 04 2020

Black Buzzard

0 Answers Avg Quality 2/10

Closures in javascript

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let counter = (function() {
    let i = 0; // private property

    return {   // public methods
        get: function() {
            alert(i);
        },
        set: function(value) {
            i = value;
        },
        increment: function() {
            alert(++i);
        }
    };
})(); // module

counter.get();      // shows 0
counter.set(6);
counter.increment(); // shows 7
counter.increment(); // shows 8

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Source: en.wikipedia.org

Tags: closures closure

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Contributed on Apr 29 2022

Ali Salman

0 Answers Avg Quality 2/10

js closure examples

Comment

function outer() {
  var counter = 0; // Backpack or Closure
  function incrementCounter() {
    return counter++;
  }
  return incrementCounter;
}

const count = outer();
count(); // 0
count(); // 1
count(); // 2

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 17 2021

Obviously you're not a golfer.

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

closure example in javascript

Comment

function outerFunction() {
  var outerVariable = 'I am an outer variable';

  function innerFunction() {
    var innerVariable = 'I am an inner variable';
    console.log(outerVariable);
  }

  return innerFunction;
}

var closureExample = outerFunction();
closureExample();

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

what is closure in JavaScript

Comment

A combination of a function object and a scope (a set of variable bindings)

in which the function's variables are resolved is called a closure.

Callbacks are functions that are passed into another function as an argument.

Closures are functions that are nested in other functions, and it's often used to avoid scope clash

with other parts of a JavaScript program

<button type="button" onclick="funClosure()">Click to Count</button>

<p id="displayValue">0</p>
<script>
const add = (function(){
	let count = 0;
    return function(){
		count += 1;
        return count;
    }
})();

function funClosure(){
  document.getElementById("displayValue").innerHTML = add();
}
</script>

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 31 2023

@CodeGrepperManu

0 Answers Avg Quality 2/10

how javascript closures work?

Comment

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

function - How do JavaScript closures work?

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