Write a function named 'Once' which accept another function 'sum' ( function sum(a,b){return a+b;}) and return a function and when this returned function called, it should return result of 'sum' (i.e a+b ) passed to 'Once' function. And every time it should return same result that got at first call .

Question

Anonym · Accepted Answer

var Once = function(sum){
      let result ;
      return function (...args){
          if(result) return result;
         
          result = sum(...args);
          return result;
      }
}

Anonym · Answer

flatten multidimensional array  in one array -

var a = [1,2,[3,4],5,[6,[7,8]]];

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