deepReplaceInObject.js

const R = require('ramda');

/**
 * wanted a functional way to do this that did not modify the params
 **/
function deepReplaceInObject(currentValue, newValue, objectToReplaceIn) {
  const paramType = R.type(objectToReplaceIn);
  if (paramType === 'Object') {
    return R.keys(objectToReplaceIn).reduce((object, key) => {
      const type = R.type(objectToReplaceIn[key]);
      if (type === 'Object' || type === 'Array') {
        return R.merge(object, {
          [key]: deepReplaceInObject(currentValue, newValue, objectToReplaceIn[key]),
        });
      } else if (objectToReplaceIn[key] === currentValue) {
        return R.merge(object, { [key]: newValue });
      }
      return R.merge(object, { [key]: objectToReplaceIn[key] });
    }, {});
  } else if (paramType === 'Array') {
    return objectToReplaceIn.reduce((array, value) => {
      const type = R.type(value);
      if (type === 'Object' || type === 'Array') {
        return [...array, deepReplaceInObject(currentValue, newValue, value)];
      } else if (value === currentValue) {
        return [...array, newValue];
      }
      return [...array, value];
    }, []);
  }
  return objectToReplaceIn;
}