Count the words

Write countWords(text). It returns an object. Each key is a word from the text. Each value is the number of times that word appears.

• A word is a run of letters (a to z) and digits (0 to 9). Any other character ends a word. Spaces, commas and dots end a word, and so do ' and -.
• The case of a letter does not matter. Write each key in lower case.
• If the text has no words, return an empty object.

Examples

Call	Result
countWords('the cat and the hat')	{ the: 2, cat: 1, and: 1, hat: 1 }
countWords('Go, go, GO!')	{ go: 3 }
countWords('')	{}