How to keep track of value using a variable, without resetting said variable on recursive calls, without using global variable, in JavaScript?

user_11931062 0
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Basically I have a recursive function to calculate space in certain structures. I want to keep track of 'space' throughout the recursion without the space value resetting on each call. I was previously using a 'space' variable declared outside the function, but it's causing me issues. Is this possible without using a global variable? How?

Current code:

var space = 0;
  
var fill = function(arr) {
    
    if(arr.length < 1) {
        return space;
    }

    for(let i=0; i<arr.length; i++){
        ... various conditions and arr manipulation ...
        space+=1
    }

    return fill(arr)
}

example input:

fill([2,4,0,9])
global global-variables recursion javascript
1 Answers

You could take a second parameter for the counting.

var fill = function(array, space = 0) {
    if (array.length < 1) return space;

    // some code with
    space++;

    return fill(array, space);
};
user_14476750
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