Branching in functional javascript using Ramda

braching.js

import R from 'ramda';

const payloadSizeWithinLimit = (payload, limit) => limit > payload.size;
const errorState = { name: 'can not be empty' };
const sizeInBytes = 50000;

let errorObj;

errorObj = R.cond([
  [R.equals(true),  R.always({})],
  [R.equals(false), R.always(errorState)],
])(payloadSizeWithinLimit(payload, sizeInBytes));

errorObj = R.ifElse(
  R.equals(true),
  R.always({}),
  R.always(errorState)
)(payloadSizeWithinLimit(payload, sizeInBytes));

// using arrow functions
errorObj = R.ifElse(
  R.equals(true),
  () => {},
  () => errorState
)(payloadSizeWithinLimit(payload, sizeInBytes));

// maybe something like
const ifTrue = (arg) => {}; // could be implemented

errorObj = ifTrue(
  R.always({}),
  R.always(errorState)
)(payloadSizeWithinLimit(payload, sizeInBytes));