fetchTe/data.either.md

Created March 11, 2016 21:21

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data.either.md

Either Example

const divide = R.curry(function (a, b) {
  return b === 0 ? Either.Left('Dicision by 0.') : Either.Right(a / b);
});

const addTwo = R.curry(function (val) {
  return val + 2;
});

let divideTwo = R.compose(map(addTwo), divide(2));

let two = divideTwo(2); // Right.val{4}
let zero = divideTwo(0); // Left.val{err}