Function tokenize

Given a string with a scale name and (optionally) a tonic, split that components.

It retuns an array with the form [ name, tonic ] where tonic can be a note name or null and name can be any arbitrary string (this function doesn"t check if that scale name exists)

Function

Example

tokenize("C mixolydean") // => ["C", "mixolydean"]
tokenize("anything is valid") // => ["", "anything is valid"]
tokenize() // => ["", ""]
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