LeetCode-JS-30DaysChallenge/Allow_One_Function_Call.js at main · Pritz69/LeetCode-JS-30DaysChallenge · GitHub

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/**
 * @param {Function} fn
 * @return {Function}
 */
var once = function(fn) {
    let f=0;
    return function(...args){
        if (f==0)
        {
            f=1;
            return fn(...args);
        }
        else
        {
            return undefined;
        }
    }
};