Examples from some() method MDN page - Nested Returns.

someExamples.js

// MDN Example - Check Inventory (nested returns) 
// See below link for converting any value to boolean
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some
const fruit = ['kiwi', 'apple', 'banana', 'avocado'];
// Check inventory for 'pineapple' and then 'apple'
/* 
  Need to pass 'arr' and 'item' param.
  If 'fruit' arg STRICTLY equals 'item' param, 
    some should return 'true'.

    DON'T FORGET TO R-E-T-U-R-N ding-dong!
*/
const checkAvailability = (arr, item) => {
  // some() iterates over array - don't need to loop.

  // return arr.some((el) => item === el); // works 

  // nested returns
  // return arr.some((el, index, arr) => {
  //   return item === el;
  // });

  // nested return
  // result = arr.some((el, index, arr) => {
  //   return item === el;
  // });
  // return result;

  return arr.some((el, index, arr) => { 
    return item === el;
});
};
// needs to match exactly
console.log(checkAvailability(fruit, 'apple')); // s/b true/false