Function or

or takes an array of parsers and runs them sequentially. It returns the results of the first parser that succeeds. You can use capture in an or:

const parser = or(capture(digit, "num"), capture(word, "name"));
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or supports backtracking by returning a nextParser:

const parser = or(str("hello"), str("hello!"));

// this will match the first parser
const result = parser("hello");

// but or returns the untried parsers as a new parser
result.nextParser("hello!"); // works

// result.nextParser is the same as or(str("hello!"))
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