which-are-in.md

Which are in? ^{6 Kyu}

^{LINK TO THE KATA - ARRAYS LISTS STRINGS REFACTORING}

Description

Given two arrays of strings a1 and a2 return a sorted array r in lexicographical order of the strings of a1 which are substrings of strings of a2.

Example 1:

a1 = ["arp", "live", "strong"]

a2 = ["lively", "alive", "harp", "sharp", "armstrong"]

returns ["arp", "live", "strong"]

Example 2:

a1 = ["tarp", "mice", "bull"]

a2 = ["lively", "alive", "harp", "sharp", "armstrong"]

returns []

Notes:

• Arrays are written in "general" notation. See "Your Test Cases" for examples in your language.
• In Shell bash a1 and a2 are strings. The return is a string where words are separated by commas.
• Beware: In some languages r must be without duplicates.

Solution

const inArray = (array1, array2) => {
  const array2JoinedBySpace = array2.join(' ')

  return array1.filter(word => array2JoinedBySpace.includes(word)).sort()
}