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How to convert number or string to ASCII in JavaScript All In One

How to convert number or string to ASCII in JavaScript All In One

ASCII dictionary generator / js 生成器 ASCII 字符字典

  // const dict = `abcdefghijklmnopqrstuvwxyz`;

  const begin = `a`.charCodeAt();
  const end = `z`.charCodeAt();
  let dict = ``;
  for (let i = begin; i <= end; i++) {
    dict += String.fromCodePoint(i);
  }
  log(`dict =`, dict);
  // dict = abcdefghijklmnopqrstuvwxy

String.fromCodePoint

convert number or string to ASCII


String.fromCodePoint(65);
//"A"
String.fromCodePoint(`65`);
//"A"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint

image

String.fromCharCode

String.fromCharCode(65)
// "A"
String.fromCharCode(`65`);
// "A"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode

``. codePointAt

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt


const icons = 'ab';

console.log(icons.codePointAt());
console.log(icons.codePointAt(0));
console.log(icons.codePointAt(1));
// 97
// 97
// 98

``.charCodeAt

ASCII character to number

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt


`a`.charCodeAt();
  // 97
 `z`.charCodeAt();
  // 122

`A`.charCodeAt();
  // 65
`Z`.charCodeAt();
  // 90

ASCII Table

printable ASCII characters

const dict = {};

for (let i = ` `.charCodeAt(); i <= 128; i++) {
  dict[i] = String.fromCodePoint(i);
}

console.log(`dict =`, dict);

/*

{
    "32": " ",
    "33": "!",
    "34": "\"",
    "35": "#",
    "36": "$",
    "37": "%",
    "38": "&",
    "39": "'",
    "40": "(",
    "41": ")",
    "42": "*",
    "43": "+",
    "44": ",",
    "45": "-",
    "46": ".",
    "47": "/",
    "48": "0",
    "49": "1",
    "50": "2",
    "51": "3",
    "52": "4",
    "53": "5",
    "54": "6",
    "55": "7",
    "56": "8",
    "57": "9",
    "58": ":",
    "59": ";",
    "60": "<",
    "61": "=",
    "62": ">",
    "63": "?",
    "64": "@",
    "65": "A",
    "66": "B",
    "67": "C",
    "68": "D",
    "69": "E",
    "70": "F",
    "71": "G",
    "72": "H",
    "73": "I",
    "74": "J",
    "75": "K",
    "76": "L",
    "77": "M",
    "78": "N",
    "79": "O",
    "80": "P",
    "81": "Q",
    "82": "R",
    "83": "S",
    "84": "T",
    "85": "U",
    "86": "V",
    "87": "W",
    "88": "X",
    "89": "Y",
    "90": "Z",
    "91": "[",
    "92": "\\",
    "93": "]",
    "94": "^",
    "95": "_",
    "96": "`",
    "97": "a",
    "98": "b",
    "99": "c",
    "100": "d",
    "101": "e",
    "102": "f",
    "103": "g",
    "104": "h",
    "105": "i",
    "106": "j",
    "107": "k",
    "108": "l",
    "109": "m",
    "110": "n",
    "111": "o",
    "112": "p",
    "113": "q",
    "114": "r",
    "115": "s",
    "116": "t",
    "117": "u",
    "118": "v",
    "119": "w",
    "120": "x",
    "121": "y",
    "122": "z",
    "123": "{",
    "124": "|",
    "125": "}",
    "126": "~",
    "127": ""
}

*/

js generator ASCII characters Dict

  const begin = `A`.charCodeAt();
  const end = `z`.charCodeAt();
  let dict = {};
  for (let i = begin; i < end; i++) {
      dict[i] = String.fromCodePoint(i)
  }
  console.log(`dict =`, dict);

/*

{
    "65": "A",
    "66": "B",
    "67": "C",
    "68": "D",
    "69": "E",
    "70": "F",
    "71": "G",
    "72": "H",
    "73": "I",
    "74": "J",
    "75": "K",
    "76": "L",
    "77": "M",
    "78": "N",
    "79": "O",
    "80": "P",
    "81": "Q",
    "82": "R",
    "83": "S",
    "84": "T",
    "85": "U",
    "86": "V",
    "87": "W",
    "88": "X",
    "89": "Y",
    "90": "Z",
    "91": "[",
    "92": "\\",
    "93": "]",
    "94": "^",
    "95": "_",
    "96": "`",
    "97": "a",
    "98": "b",
    "99": "c",
    "100": "d",
    "101": "e",
    "102": "f",
    "103": "g",
    "104": "h",
    "105": "i",
    "106": "j",
    "107": "k",
    "108": "l",
    "109": "m",
    "110": "n",
    "111": "o",
    "112": "p",
    "113": "q",
    "114": "r",
    "115": "s",
    "116": "t",
    "117": "u",
    "118": "v",
    "119": "w",
    "120": "x",
    "121": "y"
}

*/




const dict = {};

for (let i = `0`.charCodeAt(); i < `9`.charCodeAt(); i++) {
  dict[i] = String.fromCodePoint(i)
}
console.log(`dict =`, dict);

const begin = `A`.charCodeAt();
const end = `z`.charCodeAt();

for (let i = begin; i < end; i++) {
  dict[i] = String.fromCodePoint(i)
}

console.log(`dict =`, dict);

demos

function scoreOfString(s: string): number {
  const dict = {};
  // const begin = `a`.charCodeAt(0);
  // const end = `z`.charCodeAt(0);
  // for (let i = begin; i <= end; i++) {
  for (let i = 97; i <= 122; i++) {
    dict[String.fromCodePoint(i)] = i;
    // dict[String.fromCharCode(i)] = i;
  }
  // console.log(`dict =`, dict);
  let arr: number[] = new Array(s.length - 1).fill(0);
  for(let i = 0; i < s.length - 1; i++) {
    arr[i] = Math.abs(dict[s[i]] - dict[s[i + 1]]);
  }
  return arr.reduce((sum, i) => sum += i, 0);
};


/* 

const begin = `A`.charCodeAt();
const end = `z`.charCodeAt();
let dict = {};
for (let i = begin; i <= end; i++) {
  dict[String.fromCodePoint(i)] = i;
}
console.log(`dict =`, dict);
// {A: 65, ..., y: 121}

const begin = `A`.charCodeAt();
const end = `z`.charCodeAt();
let dict = {};
for (let i = begin; i <= end; i++) {
  dict[i] = String.fromCodePoint(i)
}
console.log(`dict =`, dict);
// {65: 'A', ..., 121: y}

 */




function scoreOfString(s: string): number {
  let arr: number[] = new Array(s.length - 1).fill(0);
  for(let i = 0; i < s.length - 1; i++) {
    arr[i] = Math.abs(s[i].charCodeAt(0) - s[i+1].charCodeAt(0));
    // arr[i] = Math.abs(s[i].codePointAt(0) - s[i + 1].codePointAt(0));
  }
  return arr.reduce((sum, i) => sum += i, 0);
};

/* 
Line 5: Char 20: error TS2554: Expected 1 arguments, but got 0.



'h'.charCodeAt()
104
'h'.charCodeAt(0)
104
'h'.charCodeAt(1)
NaN

'h'.codePointAt()
104
'h'.codePointAt(0)
104
'h'.codePointAt(1)
undefined



 */

https://leetcode.com/problems/score-of-a-string/description/?envType=daily-question&envId=2024-06-01

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refs

https://leetcode.com/problems/valid-palindrome/

https://leetcode.com/submissions/detail/368171836/

http://facweb.cs.depaul.edu/sjost/it212/documents/ascii-pr.htm

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posted @ 2020-07-17 22:10  xgqfrms  阅读(317)  评论(6)  编辑  收藏  举报