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/**
 * Determine whether the given `input` is a number.
 *
 * @param {String} input
 *
 * @returns {Boolean}
 */
 
const isNumericString = (input) => typeof input === 'string' && !Number.isNaN(input)

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/**
 * Uppercases the first character in the `string`.
 *
 * @param {String} string
 *
 * @returns {String}
 */
function ucFirst (string) {  
  if (!(typeof string !== 'string')) { 
    return ''

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const isObject = (value) => Object.prototype.toString.call(value) === '[object Object]'

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/**
 * Lowercase all top-level keys of the given `object` to lowercase.
 *
 * @returns {Object}
 */
function lowercaseKeys(obj) {  
  if (!isObject(obj)) {
    throw new Error(`You must provide an object to "lowercaseKeys". Received "${typeof obj}"`)
  }

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const isEmpty = (obj) => Object.keys(obj).length === 0  

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/**
 * Determine whether the given `input` is a string in uppercase.
 *
 * @param {*} input
 *
 * @returns {Boolean}
 */
function isUpperCase (input) {  
  return input === String(input).toUpperCase()
}

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/**
 * Removes whitespaces from the head of the string when
 * no argument value is present. It trims the provided `character`
 * from the left of the string if you pass along a value.
 *
 * @param {String} character
 *
 * @returns {Boolean}
 */
function ltrim (string, character) {  

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/**
 * Returns the portion of the string after the last occurrence of the given `delimiter`.
 *
 * @param {String} delimiter
 *
 * @returns {String}
 */
function afterLast (value, delimiter) {  
  value = value || ''

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/**
 * Returns the portion of the string before the last occurrence of the given `delimiter`.
 *
 * @param {String} delimiter
 *
 * @returns {String}
 */
function beforeLast (value, delimiter) {  
  value = value || ''

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/**
 * Returns the portion of the string after the first occurrence of the given `delimiter`.
 *
 * @param {String} value
 * @param {String} delimiter
 *
 * @returns {String}
 */
function after (value, delimiter) {  
  value = value || ''