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JavaScript How to change parameter inside function?

This is my code:

function makeCounter(x)
x = x
var counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 0


Now, I want to know how to edit the code so that the value will be 1 after counter.increment().

6 Answers
6

Update value using this.value & assign value of x to it

value

this.value

function makeCounter(x) 0;
var obj =
value: x,
increment: function()
x = x + 1;
this.value = x
return x;
,
decrement: function()
x = x - 1;
this.value = x
return x;


return obj;

var counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 1

You need to update value after the increase or decrease and use this.value instead of x variable.

function makeCounter(value = 0)
return
value,
increment ()
return ++this.value;
,
decrement ()
return --this.value;

;


let counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 1

You need to update value after the increase or decrease and use this.value instead of x variable.

value

this.value

x

You can see my code:

function makeCounter(x)
var counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 1
console.log(counter.increment())//output is 2
console.log(counter.value); // output is 2


function makeCounter(x)
return 0,
increment ()
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Increment_()
return ++this.value;
,
decrement ()
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Decrement_(--)
return --this.value;

;


let counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value);


In case of nesting, you might fail to use this at some point, you can go with the object's name. as long as you are calling it inside a function

function makeCounter(x)
var counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 1

You could use a getter on the object being returned. You get control to do any business logic you like when you do counter.value.

counter.value

You could change your code like so

function makeCounter(x)
x = x
var counter = makeCounter();

console.log(counter.increment()); // output is 1
console.log(counter.value); // output is 1

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