jsmp-infra-plotnikov/src/lib/string/transformString.js

jsmp test package that contains some mutations

import { isString } from 'lodash';

const operationTypes = {
  Uppercase: 'uppercase',
  Lowercase: 'lowercase'
};

const toUppercase = string => string.toUpperCase();

const toLowerCase = string => string.toLowerCase();


const operationToActionMap = new Map([
  [operationTypes.Uppercase, toUppercase],
  [operationTypes.Lowercase, toLowerCase]
]);

export default function transformString (string, operation) {
  try {

    if (!isString(string)) {
      return null;
    }

    const isSupportedOperation = Object.values(operationTypes).includes(operation);

    if (!isSupportedOperation) {
      return string;
    }

    return operationToActionMap.get(operation)(string);
  } catch (e) {
    console.log(e);
  }
}