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fixing Waltz of the Types first example #606

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fixing Waltz of the Types first example #606

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4 changes: 2 additions & 2 deletions ch12.md
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ Let's get weird:
// readFile :: FileName -> Task Error String

// firstWords :: String -> String
const firstWords = compose(intercalate(' '), take(3), split(' '));
const firstWords = compose(intercalate(' '), take(3), split(' '), toString);

// tldr :: FileName -> Task Error String
const tldr = compose(map(firstWords), readFile);
Expand Down Expand Up @@ -149,7 +149,7 @@ Time to revisit and clean our initial examples.
// readFile :: FileName -> Task Error String

// firstWords :: String -> String
const firstWords = compose(intercalate(' '), take(3), split(' '));
const firstWords = compose(intercalate(' '), take(3), split(' '), toString);

// tldr :: FileName -> Task Error String
const tldr = compose(map(firstWords), readFile);
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6 changes: 5 additions & 1 deletion support/index.js
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Expand Up @@ -600,7 +600,11 @@ const toUpperCase = s => s.toUpperCase();


// traverse :: (Applicative f, Traversable t) => (a -> f a) -> (a -> f b) -> t a -> f (t b)
const traverse = curry((of, fn, f) => f.traverse(of, fn));
const traverse = curry((of, fn, f) =>
Array.isArray(f)
? f.reduce((innerF, a) => fn(a).map(append).ap(innerF), of([]))
: f.traverse(of, fn)
);


// unsafePerformIO :: IO a -> a
Expand Down