Struggling with making successful callback return statements

Having some difficulty skipping callbacks returns. Here is the query:

Create a function named tap that takes an array called items and a callback function, cb. The callback function should be executed on the array, and then the array itself should be returned no matter what the callback returns.

Here's My Solution:

function tap(items, cb){
  let result = items.map(cb)
  return result;
}

Examples:

console.log(tap([1, 2, 3], function (items) {
  items.pop();
})).reverse();  // [2,1]

console.log(tap(["a", "b", "c"], function (items) {
  return items[0];
}));  // ["a","b","c"]

By implementing this code, I expect it to apply the callback functions to the items array.

I encountered the following results for each test case:

a. TypeError: items.pop is not a function
b. [ 'a', 'b', 'c' ]

Answer №1

The guidelines do not mention anything about mapping the function, instead, you are instructed to simply execute it on the array as a whole.

As the objective is to return the original array, there is no need to store the callback result in a variable. Just ensure to return items.

Additionally, remember to apply reverse() on the outcome of tap(). While you attempted to call it after console.log(), this method does not yield any return value.

function tap(items, cb){
  cb(items);
  return items;
}

console.log(tap([1, 2, 3], function (items) {
  items.pop();
}).reverse());  // [2,1]

console.log(tap(["a", "b", "c"], function (items) {
  return items[0];
}));  // ["a","b","c"]

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