Array of uppercase and lowercase letters

alphabet.js

const letters = (() => {
  const caps = [...Array(26)].map((val, i) => String.fromCharCode(i + 65));
  return caps.concat(caps.map(letter => letter.toLowerCase()));
})();

Just leaving this here if anyone needs...

const alphabet = {
  a: 0,
  b: 1,
  c: 2,
  d: 3,
  e: 4,
  f: 5,
  g: 6,
  h: 7,
  i: 8,
  j: 9,
  k: 10,
  l: 11,
  m: 12,
  n: 13,
  o: 14,
  p: 15,
  q: 16,
  r: 17,
  s: 18,
  t: 19,
  u: 20,
  v: 21,
  w: 22,
  x: 23,
  y: 24,
  z: 25,
};

If this was an array anybody could get the infexOf any character they want.

const lowerCaseLetters = ['a', 'b','c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's','t', 'u', 'v', 'w', 'x', 'y', 'z'];
const upperCaseLetters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
const numbersZeroToNine = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
const selectedSpecialCharacters = ['!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '+', '-', '.', '~', '|', '<', '>', '=', '-', '_', '/', ':', ';', '?', '[', ']', '{', '}', '~'];

see also https://owasp.org/www-community/password-special-characters for a longer list of special characters (including ", ', `, \, and space)

Just leaving this here if anyone needs...

const alphabet = {
  a: 0,
  b: 1,
  c: 2,
  d: 3,
  e: 4,
  f: 5,
  g: 6,
  h: 7,
  i: 8,
  j: 9,
  k: 10,
  l: 11,
  m: 12,
  n: 13,
  o: 14,
  p: 15,
  q: 16,
  r: 17,
  s: 18,
  t: 19,
  u: 20,
  v: 21,
  w: 22,
  x: 23,
  y: 24,
  z: 25,
};

If this was an array anybody could get the infexOf any character they want.

True but that wouldn't be as efficient as an O(1) lookup as is the case with an object. I used the above in a leetcode problem so time complexity was a concern.

Just leaving this here if anyone needs...

const alphabet = {
  a: 0,
  b: 1,
  c: 2,
  d: 3,
  e: 4,
  f: 5,
  g: 6,
  h: 7,
  i: 8,
  j: 9,
  k: 10,
  l: 11,
  m: 12,
  n: 13,
  o: 14,
  p: 15,
  q: 16,
  r: 17,
  s: 18,
  t: 19,
  u: 20,
  v: 21,
  w: 22,
  x: 23,
  y: 24,
  z: 25,
};

If this was an array anybody could get the infexOf any character they want.

True but that wouldn't be as efficient as an O(1) lookup as is the case with an object. I used the above in a leetcode problem so time complexity was a concern.

in what case would you need to get the indexOf a character if your using an object anyways?

Just leaving this here if anyone needs...

const alphabet = {
  a: 0,
  b: 1,
  c: 2,
  d: 3,
  e: 4,
  f: 5,
  g: 6,
  h: 7,
  i: 8,
  j: 9,
  k: 10,
  l: 11,
  m: 12,
  n: 13,
  o: 14,
  p: 15,
  q: 16,
  r: 17,
  s: 18,
  t: 19,
  u: 20,
  v: 21,
  w: 22,
  x: 23,
  y: 24,
  z: 25,
};

If this was an array anybody could get the infexOf any character they want.

True but that wouldn't be as efficient as an O(1) lookup as is the case with an object. I used the above in a leetcode problem so time complexity was a concern.

in what case would you need to get the indexOf a character if your using an object anyways?

Plenty of string problems on Leetcode has this need. Although for most it would be starting at 1 not 0 like the original snippet I posted. Anyway since then I found a easier way to do this:

// If you need to map alphabets to their corresponding index
"a".charCodeAt() - 96; // 1
"z".charCodeAt() - 96; // 26

Just leaving this here if anyone needs...

const alphabet = {
  a: 0,
  b: 1,
  c: 2,
  d: 3,
  e: 4,
  f: 5,
  g: 6,
  h: 7,
  i: 8,
  j: 9,
  k: 10,
  l: 11,
  m: 12,
  n: 13,
  o: 14,
  p: 15,
  q: 16,
  r: 17,
  s: 18,
  t: 19,
  u: 20,
  v: 21,
  w: 22,
  x: 23,
  y: 24,
  z: 25,
};

If this was an array anybody could get the infexOf any character they want.

True but that wouldn't be as efficient as an O(1) lookup as is the case with an object. I used the above in a leetcode problem so time complexity was a concern.

in what case would you need to get the indexOf a character if your using an object anyways?

Plenty of string problems on Leetcode has this need. Although for most it would be starting at 1 not 0 like the original snippet I posted. Anyway since then I found a easier way to do this:

// If you need to map alphabets to their corresponding index
"a".charCodeAt() - 96; // 1
"z".charCodeAt() - 96; // 26

interesting thanks

std::map<std::string,int> cc_map {{"A",0}, {"B",0}, {"C",0}, {"D",0}, {"E",0}, {"F",0}, {"G",0}, {"H",0}, {"I",0}, {"J",0}, {"K",0}, {"L",0}, {"M",0},
                              {"N",0}, {"O",0}, {"P",0}, {"Q",0}, {"R",0}, {"S",0}, {"T",0}, {"U",0}, {"V",0}, {"W",0}, {"X",0}, {"Y",0}, {"Z",0}, 
                              {"a",0}, {"b",0}, {"c",0}, {"d",0}, {"e",0}, {"f",0}, {"g",0}, {"h",0}, {"i",0}, {"j",0}, {"k",0}, {"l",0}, {"m",0},
                              {"n",0}, {"o",0}, {"p",0}, {"q",0}, {"r",0}, {"s",0}, {"t",0}, {"u",0}, {"v",0}, {"w",0}, {"x",0}, {"y",0}, {"z",0},
                              {"0",0},{"1",0},{"2",0},{"3",0},{"4",0},{"5",0},{"6",0},{"7",0},{"8",0},{"9",0},
                              {"!",0}, {"@",0}, {"#",0}, {"$",0}, {"%",0}, {"^",0}, {"&",0}, {"*",0}, {"(",0}, {")",0}, {"+",0}, {"-",0}, {".",0},
                              {"~",0}, {"|",0}, {"<",0}, {">",0}, {"=",0}, {"-",0}, {"_",0}, {"/",0}, {":",0}, {";",0}, {"?",0}, {"[",0}, {"]",0}, 
                              {"{",0}, {"}",0}, {"~",0},};

leaving this here in case anyone else needs this.

["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]

exactly what I needed Thx

["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]

W mans

Legend

In case anyone needs the full set of lower and upper case Latin characters (all of the various accented versions), built from this table:

const lowercaseString = "abcdefghijklmnopqrstuvwxyzàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿāăąćĉċčďđēĕėęěĝğġģĥħĩīĭįıijĵķĺļľŀłńņňŋōŏőœŕŗřśŝşšţťŧũūŭůűųŵŷźżžƃƅƈƌƒƙơƣƥƨƭưƴƶƹƽdžljnjǎǐǒǔǖǘǚǜǟǡǣǥǧǩǫǭǯdzǵǻǽǿȁȃȅȇȉȋȍȏȑȓȕȗɓɔɗɘəɛɠɣɨɩɯɲɵʃʈʊʋʒḁḃḅḇḉḋḍḏḑḓḕḗḙḛḝḟḡḣḥḧḩḫḭḯḱḳḵḷḹḻḽḿṁṃṅṇṉṋṍṏṑṓṕṗṙṛṝṟṡṣṥṧṩṫṭṯṱṳṵṷṹṻṽṿẁẃẅẇẉẋẍẏẑẓẕạảấầẩẫậắằẳẵặẹẻẽếềểễệỉịọỏốồổỗộớờởỡợụủứừửữựỳỵỷỹ";
const lowercaseChars = [...lowercaseString];
const uppercaseChars = [...lowercaseString.toLocaleUpperCase()];

Upper and lowercase for c:
{'a', 'b','c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's','t', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'}