Gets the index of the first occurrence of an element in an array (a JSON array)

    functionFirstIndex (arr, text) {//returns 1 if the element does not exist in the arrayLet Firstval =-1;  for(Let i = 0; i < arr.length; i++) {        //JSON (arr[i].id = = text)        if(Arr[i] = = =text) {Firstval=i; returnFirstval;  Break; }      }      returnFirstval; }    //JSON Array    //Let array = [{id: ' 1 '}, {id: ' 2 '}, {id: ' 3 '}];    //Let text = "2";    //Normal ArrayLet array = [1, 2, 3, 4, 5]; Let text= 3; Console.log ("Gets an element that first appears in the index of the array", FirstIndex (array, text));

Gets the index of the first occurrence of an element in an array (a JSON array)