closure in javascript

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tokyo answered on January 18, 2020 Popularity 10/10 Helpfulness 4/10

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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

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Tags: javascript

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Contributed on Dec 22 2021

tokyo

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();

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Tags: javascript j

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Contributed on Nov 07 2020

Joyous Jackal

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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

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Contributed on Jan 18 2020

Grieving Goshawk

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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

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Source: www.javascripttutorial.net

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Contributed on Feb 01 2022

madhav

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closure in javascript

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

var myFunc = makeFunc();
myFunc();

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Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jul 04 2020

Black Buzzard

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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

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Contributed on Jun 16 2022

Himanshu Jangid

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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.

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Source: developer.mozilla.org

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Contributed on Jan 20 2022

Graceful Grivet

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what is closure in javascript

Comment

function OuterFunction() {

    var outerVariable = 100;

    function InnerFunction() {
        alert(outerVariable);
    }

    return InnerFunction;
}
var innerFunc = OuterFunction();

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Contributed on May 25 2021

ServerMonk

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js closure examples

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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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Contributed on May 17 2021

Obviously you're not a golfer.

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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

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Source: en.wikipedia.org

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Contributed on Apr 29 2022

Ali Salman

0 Answers Avg Quality 2/10

closure in javascript

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