text: function findIndex(array, callback, configurableThis) {
          let arrayLength = array.length;
          let findIndexCallback = callback;
          findIndexCallback = callback.bind(configurableThis);
  
          for(let i = 0; i < arrayLength; i++) {
                  if(findIndexCallback(array[i], i, array)) {
                   return i;
                  } 
          }
          return -1;
  }
  
  module.exports = findIndex;
  