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Exercise 6

Use map and filter to first determine the lengths of all the elements in an array of string values, then discard the even values (keep the odd values).

let arr = ['a', 'abcd', 'abcde', 'abc', 'ab'];
console.log(oddLengths(arr)); // => [1, 5, 3]

Note that it is possible to solve this problem without using map. However, our intent is to show how you can combine multiple functions to achieve a desired result.

Your first step should be to create an array of the lengths, e.g., [1, 4, 5, 3, 2].

Solution

function oddLengths(strings) {
  let lengths = strings.map((letters) => letters.length);
  let oddLengths = lengths.filter((number) => number % 2 === 1);
  return oddLengths;
}

let arr = ['a', 'abcd', 'abcde', 'abc', 'ab'];
console.log(oddLengths(arr));

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