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what is closure in JavaScript

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@CodeGrepperManu answered on January 18, 2020 Popularity 9/10 Helpfulness 2/10

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what is closure in JavaScript

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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

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Contributed on Mar 31 2023

@CodeGrepperManu

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

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

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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

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javascript closure

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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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 18 2020

Grieving Goshawk

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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

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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

Javascript Closure

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 Jun 17 2022

Peter Ime

0 Answers Avg Quality 2/10

javascript closure

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

//my words: what this code do is basically a nested function that will return
//its inner function (un-activated). So var add5 in line 7 activated the outer
//function with 5 as parameter which makes add5 is now the nameless function at
//line 2 that will return 5 + y;

//MDN words:
//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 3/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jan 20 2022

Graceful Grivet

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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();

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Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

javascript closure

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function numberGenerator() {
  // Local “free” variable that ends up within the closure
  var num = 1;
  function checkNumber() { 
    console.log(num);
  }
  num++;
  return checkNumber;
}

var number = numberGenerator();
number(); // 2

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Jun 11 2022

Teodor Savov

0 Answers Avg Quality 2/10

what is closure in JavaScript

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