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How I can reset variable value when function end?

I have such function and global variable (as array):

const arraysList = []

export const changeColorCategories = (array, draggedColumnId) => {
    const isColor = arraysList.length ? arraysList[0][0]?.color : [];

    if (typeof isColor === 'string') {
        firstLevelColor = isColor;
    }

    return array.map((item, index, categories) => {
        item.color = draggedColumnId !== 3 ? '#010172' : '#000000';
        arraysList.push(categories);
        
        if (firstLevelColor && !draggedColumnId) {
            item.color = firstLevelColor;
        }

        if (item?.children?.length) {
            changeColorCategories(item.children);
        }
        
        return item;
    })
} 

Every call of this function push some data to array. In this function I use recursion. So how i can clear this array only when this function will end it’s work.

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Answer

You can call the recursion function inside another function this way you can run anything you want when the function ends

const arraysList = []

export const changeColorCategories = (array, draggedColumnId) => {
    const isColor = arraysList.length ? arraysList[0][0]?.color : [];

    if (typeof isColor === 'string') {
        firstLevelColor = isColor;
    }

    return array.map((item, index, categories) => {
        item.color = draggedColumnId !== 3 ? '#010172' : '#000000';
        arraysList.push(categories);
        
        if (firstLevelColor && !draggedColumnId) {
            item.color = firstLevelColor;
        }

        if (item?.children?.length) {
            changeColorCategories(item.children);
        }
        
        return item;
    })
} 

function runRucFunc(){
    const result = changeColorCategories();
    //Your other code goes here

    return result;
}
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