Increment value each time when you run function

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So I need a function which increments the value of a variable say n=0. When ever the function runs, the value of this varible must be incremented and it should not be equal to 0 again. For example consider the following code :

function increment(){
  var n = 0;
  n++;
  return n;
}

Now everytime you run this function you get a value of 1. But my requirement is if you run this function for the 1st time, it should be 1, if you run it for the second time, it should be 2 and so on. Unless you refresh the html page and run the function again, it should not be equal to 0. Can anybody help me?

I'm new to coding and any small help is appreciated. Thanks in advance!!!

You need to declare n outside of the function.

var n = 0;

function increment(){

  n++;
  return n;
}

The problem is scopes. when you declare a variable inside of a function it is bound to the local scope of the function. as soon as the function is done the variable is gone.

declaring the variable in the root level of the script places it in the global scope.

another way to do this would be to have a variable outside that you're passing around and then you pass it to the function via a parameter.

var i = 0;

function increment(n){

  n++;
  return n;
}

i=increment(i);

for more information on scopes and variables, review this page: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Values,_variables,_and_literals#Variable_scope

Increment value each time when you run function, So I need a function which increments the value of a variable say n=0. When ever the function runs, the value of this varible must be incremented and it should  Use a global variable. A local variable will reset every time the function is run. Many people (with good reason) frown on global variables, but they are often a natural way to keep track of a game state. – John Coleman Jan 16 '17 at 14:10

Create a closure to hold the value

Closures are functions that refer to independent (free) variables.

In short, variables from the parent function of the closure remain bound from the parent's scope.

var increment = (function(n) {
  return function() {
    n += 1;
    return n;
  }
}(0)); // -1 if you want the first increment to return 0

console.log(increment());
console.log(increment());
console.log(increment());

Increment a Number with JS - JavaScript, Let's also say I want to create a function named newCount which increments the value of count by 1 and returns the new value of count. See the  function increment(){ var n = 0; n++; return n; }. Now everytime you run this function you get a value of 1. But my requirement is if you run this function for the 1st time, it should be 1, if you run it for the second time, it should be 2 and so on.

You can bind the data to the function (since functions are objects).

function increment(){
    increment.n = increment.n || 0;
    return ++increment.n;
}

Learn How to Utilize JavaScript Closures | Pluralsight, That's why we can invoke the increment function from the global scope The myCounter1 object is created by calling the counter function with we created 2 different objects each with a pair of functions that has its own scope. In other words, by the time that the Timeout finishes, the value of i will be 5,  To increment numbers based on another column when value changes, the following simple formula may help you. 1. Enter this formula: =IF(A2<>A1,1,B1+1) into a blank cell which beside your data, B2, for instance, see screenshot: 2. Then drag the fill handle down to the cells that you want to fill sequence numbers and restart for every change in

var n = 0;
function increment(){
  n++;
  return n;
}

JavaScript Increment ++ and Decrement --, The next time the operator is used, we get the result of the +1 , or -1 . Using ++/-- Before the Operand. If you'd rather make the variable increment/decrement before I publish 4 articles on web development each week. Please  The volatile COLUMN function caused the last cell reference to increment by 1 each time you copied it across to a new column. This is because the COLUMN function always returns the column number (not letter) of the cell that houses it unless you reference a different cell. Alternatively, you can use the Paste Special » Transpose feature in Excel.

Learning about scopes will help you greatly. What you want here is the variable 'n' to be of a global scope.

 var n = 0; //Declare n outside of the function makes it accessible to the function
            //and to any other functions or expressions that want access to n
 function inc() {
     n++;
 }

6. Iteration, Trace the execution of this function call to convince yourself that it works. The variable count is initialized to 0 and then incremented each time the loop body is​  I know this is an old post but its relevant to what I'm working on currently. What I'm aiming to do is create next/previous page buttons at the top of a html page, and say I'm on 'book.html', with the current 'display' ID content being 'page-1.html' through ajax, if i click the 'next' button it will load 'page-2.html' through ajax, WITHOUT reloading the page.

JavaScript Function Closures, You could use a global variable, and a function to increase the counter: solution above: Any code on the page can change the counter, without calling add(). It did not work because we reset the local counter every time we call the function. Because of the post increment operation, the initial value of count (which is 0) is printed by the first println() function, and only incremented after this. The next println() function prints the new incremented value (now 1) and then the increment operator in the statement increments the value of count after it has been printed – it is now incremented to 2.

Incrementing/Decrementing Operators - Manual, Decrementing NULL values has no effect too, but incrementing them results in 1. post-incrementing in a for-loop and recursive function calls (don't use it in the latter!) And the 'headache' mistake, post-increment as parameter of a recursive call: I conducted it many times, each time going through a loop one million  You can define your schedule to run a request as soon as possible, at a specific time, or repeatedly at specific intervals, on specific days of the week or month. 9. Choose Schedule to open the Scheduling window.

$INCREMENT, You can use the $GET function to return the current value of a variable. simultaneously increment the same global through $INCREMENT, each process receives a unique, In some situations, certain numbers may be skipped due to timing issues. You can execute $INCREMENT as an argument of the DO command. Normally, there is no direct way for you to solve this task in Excel, but, here, I will create a VBA code to deal with it. 1. Hold down the ALT + F11 keys to open the Microsoft Visual Basic for Applications window. 2. Click Insert > Module, and paste the following code in the Module Window. VBA code: Auto increment cell value after each printing:

Comments
  • +1, but can be simplified to function increment() { return ++n; }
  • I'm not going for simple, I'm going or informative :)
  • Ok thanks for answering the above qn. My main motive for this is that I wanted to implement a system in which a button must change it's color when clicked and it should change back to it's original color when clicked again. Any suggestions??
  • @Gopal1216 the easiest way would be to use jQuery. add a toggle class to the click that will add a css class to it. But it's a bit off topic for this question, why don't you open a new question directly asking what you're looking for?
  • Just as easy to use plain Javascript. :) But definitely off topic for this question. Create another question.
  • var increment = (function(n) { return function() { return ++n; } }(0));
  • Ok thanks for answering the above qn. My main motive for this is that I wanted to implement a system in which a button must change it's color when clicked and it should change back to it's original colo when clicked again. Any suggestions??
  • Look at jquery toggleClass()