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how javascript closures work?

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Himanshu Jangid answered on May 17, 2021 Popularity 10/10 Helpfulness 2/10

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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

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Source: stackoverflow.com

Tags: closures javascript

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Contributed on Jun 16 2022

Himanshu Jangid

0 Answers Avg Quality 2/10

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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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.javascripttutorial.net

Tags: closures closure

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Contributed on Feb 01 2022

madhav

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: en.wikipedia.org

Tags: closures closure

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Contributed on Apr 29 2022

Ali Salman

0 Answers Avg Quality 2/10

closure example in javascript

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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();

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Source: Grepper

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Contributed on Sep 11 2023

YOU.com

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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 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 31 2023

@CodeGrepperManu

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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

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Source: Grepper

Tags: javascript j

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Contributed on May 17 2021

Obviously you're not a golfer.

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JavaScript Closures

Comment

function outerFunction() {
  var outerVariable = 'I am from the outer function';

  function innerFunction() {
    console.log(outerVariable);
  }

  return innerFunction;
}

var closure = outerFunction();
closure(); // Output: 'I am from the outer function'

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: chat.openai.com

Tags: closures closure

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Contributed on Jun 16 2023

Asim Ehmedov

0 Answers Avg Quality 2/10

JavaScript Closures

Comment

// javascript closure example

// outer function
function greet() {
    // variable defined outside the inner function
    let name = 'John';
    // inner function
    function displayName() {

        // accessing name variable
        return 'Hi' + ' ' + name;
      
    }
    return displayName;
}

const g1 = greet();
console.log(g1); // returns the function definition
console.log(g1()); // returns the value

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: closures closure

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Contributed on May 22 2022

SAMER SAEID

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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

JavaScript - Closures

Comment

function makeAdder(x) {
  return function(y) {
    return x + y;
  };
}

var add5 = makeAdder(5);
var add10 = makeAdder(10);

console.log(add5(2));  // 7
console.log(add10(2)); // 12

//=====
//add5 and add10 are both closures. 
//They share the same function body definition, but store different lexical environments. 
//In add5's lexical environment, x is 5, while in the lexical environment for add10, x is 10.

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: closures closure

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Contributed on Jul 19 2021

The Arborist

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how javascript closures work?

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