text: import {isObject, isString} from 'lib/assert';
  
  // cast first char to uppercase
  export const ucFirst = (str) => {
    return str.charAt(0).toUpperCase() + str.slice(1);
  }
  
  // cast first char to lowercase
  export const lcFirst = (str) => {
    return str.charAt(0).toLowerCase() + str.slice(1);
  }
  