How to convert a camel-case string to dashes in JavaScript?

Question

I want to convert these strings:

fooBar
FooBar

into:

foo-bar
-foo-bar

How would I do this in JavaScript the m

Answer 1

For those who do not need the preceding hyphen:

console.log ("CamelCase".replace(/[A-Z]/g, (match, offset) => (offset > 0 ? '-' : '') + match.toLowerCase()))