CodeParkWrite countWords(text) that returns a Map from each word in text to the number of times it appears.
- A word is a run of letters
a–zand digits0–9. Everything else separates words: spaces, punctuation, apostrophes and line breaks. So"don't"counts as two words,"don"and"t". - Counting ignores case:
"The"and"the"are the same word. Store keys in lowercase. - Keys must be in the order each word first appears in the text.
- If there are no words, return an empty
Map.
Tip: text.toLowerCase().match(/[a-z0-9]+/g) gives you an array of the words. It gives null when there are no words. You write the counting yourself.
Input: text = "Go, go, GO team!"
Output: Map { "go" → 3, "team" → 1 }
Input: text = "The cat saw the other cat."
Output: Map { "the" → 2, "cat" → 2, "saw" → 1, "other" → 1 }
Input: text = "...!"
Output: Map {}