An Javascript function to remove accents and others characters from an input string.

javascript-remove-accents.js

// Example: https://codepen.io/marcelo-ribeiro/pen/OJmVOyW

const accentsMap = new Map([
  ["A", "Á|À|Ã|Â|Ä"],
  ["a", "á|à|ã|â|ä"],
  ["E", "É|È|Ê|Ë"],
  ["e", "é|è|ê|ë"],
  ["I", "Í|Ì|Î|Ï"],
  ["i", "í|ì|î|ï"],
  ["O", "Ó|Ò|Ô|Õ|Ö"],
  ["o", "ó|ò|ô|õ|ö"],
  ["U", "Ú|Ù|Û|Ü"],
  ["u", "ú|ù|û|ü"],
  ["C", "Ç"],
  ["c", "ç"],
  ["N", "Ñ"],
  ["n", "ñ"]
]);

const reducer = (acc, [key]) => acc.replace(new RegExp(accentsMap.get(key), "g"), key);

export const removeAccents = (text) => [...accentsMap].reduce(reducer, text);

javascript-slugify-normalize.js

export const slugify = text => text
  .replace(/\s|_|\(|\)/g, "-")
  .normalize("NFD").replace(/\p{Diacritic}/gu, "")
  .toLowerCase()

javascript-slugify.js

// Example: https://codepen.io/marcelo-ribeiro/pen/PomqOvE

const accentsMap = new Map([
  ["-", "\\s|\\.|_"],
  ["a", "á|à|ã|â|ä"],
  ["e", "é|è|ê|ë"],
  ["i", "í|ì|î|ï"],
  ["o", "ó|ò|ô|õ|ö"],
  ["u", "ú|ù|û|ü"],
  ["c", "ç"],
  ["n", "ñ"]
]);

const reducer = (acc, [key]) => acc.replace(new RegExp(accentsMap.get(key), "gi"), key);

export const slugify = (text) => [...accentsMap].reduce(reducer, text.toLowerCase());

javscript-remove-accents-normalize.js

export const removeAccents = text => text.normalize("NFD").replace(/\p{Diacritic}/gu, "")

Thanks a lot for this snippet.
I improved for ES6 use, in case anyone might want it:

const accentsMap = {
  a: 'á|à|ã|â|À|Á|Ã|Â',
  e: 'é|è|ê|É|È|Ê',
  i: 'í|ì|î|Í|Ì|Î',
  o: 'ó|ò|ô|õ|Ó|Ò|Ô|Õ',
  u: 'ú|ù|û|ü|Ú|Ù|Û|Ü',
  c: 'ç|Ç',
  n: 'ñ|Ñ',
};

export const slugify = text => Object.keys(accentsMap).reduce((acc, cur) => acc.replace(new RegExp(accentsMap[cur], 'g'), cur), text);

Thank you for sharing! I used part of the your code to improve the ES6 version.
I hope you enjoy 😃