stringUtil.js

/**
 * JS String Utils
 * @author Dexter Brylle Matos <dexterbrylle@gmail.com>
 */

'use strict'

function toString (value) {
  return value === null ? '' : value.toString()
}

function replaceAccents (str) {
  str = str.toString()
  // verify if string has accents and replace them
  // https://stackoverflow.com/questions/23476532/check-if-string-contains-only-letters-in-javascript
  if (str.search(/[\xC0-\xFF]/g) > -1) {
    str = str
      .replace(/[\xC0-\xC5]/g, 'A')
      .replace(/[\xC6]/g, 'AE')
      .replace(/[\xC7]/g, 'C')
      .replace(/[\xC8-\xCB]/g, 'E')
      .replace(/[\xCC-\xCF]/g, 'I')
      .replace(/[\xD0]/g, 'D')
      .replace(/[\xD1]/g, 'N')
      .replace(/[\xD2-\xD6\xD8]/g, 'O')
      .replace(/[\xD9-\xDC]/g, 'U')
      .replace(/[\xDD]/g, 'Y')
      .replace(/[\xDE]/g, 'P')
      .replace(/[\xE0-\xE5]/g, 'a')
      .replace(/[\xE6]/g, 'ae')
      .replace(/[\xE7]/g, 'c')
      .replace(/[\xE8-\xEB]/g, 'e')
      .replace(/[\xEC-\xEF]/g, 'i')
      .replace(/[\xF1]/g, 'n')
      .replace(/[\xF2-\xF6\xF8]/g, 'o')
      .replace(/[\xF9-\xFC]/g, 'u')
      .replace(/[\xFE]/g, 'p')
      .replace(/[\xFD\xFF]/g, 'y')
  }
  return str
}

function removeNonWord (str) {
  let PATTERN = /[^\x20\x2D0-9A-Z\x5Fa-z\xC0-\xD6\xD8-\xF6\xF8-\xFF]/g
  str = this.toString(str)
  return str.replace(PATTERN, '')
}

 // https://stackoverflow.com/questions/2970525/converting-any-string-into-camel-case
 function camelCase (str) {
  str = this.toString(str)
  str = this.replaceAccents(str)
  str = this.removeNonWord(str).replace(/[-_]/g, ' ')

  if (/[a-z]/.test(str) && /^|\s[A-Z]+\s|$/.test(str)) {
    str = str.replace(/\s(\w+)/g, function (word, m) {
      return /^[A-Z]+$/.test(m) ? word : this.lowerCase(word)
    })
  } else if (/\s/.test(str)) {
    str = this.lowerCase(str)
  }

  return str
    .replace(/\s[a-z]/g, this.upperCase)
    .replace(/^\s*[A-Z]+/g, this.lowerCase)
    .replace(/\s+/g, '')
}

// Transform first letter of word to uppercase
  // https://stackoverflow.com/questions/43785788/convert-string-to-title-case-after-dash-or-slash
  function properCase (str) {
    str = this.toString(str)
    return this.lowerCase(str).replace(/^\w|\s\w/g, this.upperCase)
  }

  // Subset of camelCase
  // https://stackoverflow.com/questions/30521224/javascript-convert-pascalcase-to-underscore-case
  function pascalCase (str) {
    str = this.toString(str)
    return this.camelCase(str).replace(/^[a-z]/, this.upperCase)
  }

  // Transform string to uppercase
  function upperCase (str) {
    str = this.toString(str)
    return str.toUpperCase()
  }

  // Transform string to lowercase
  function lowerCase (str) {
    str = str.toString()
    return str.toLowerCase()
  }
  function slugify (s, d) {
    s = this.toString(s)

    if (d === null) {
      d = '-'
    }

    s = this.replaceAccents(s)
    s = this.removeNonWord(s)
    s = this.trim(s)
      .replace(/ +g/, d)
      .toLowerCase()

    return s
  }

  function contains (s, ss, fi) {
    s = this.toString(s)
    ss = this.toString(ss)
    return s.indexOf(ss, fi) !== -1
  }