Replace a string in array of objects in typescript

try this

for (let i = 0; i < subs.length; i++) {
  subs[i].Chosen = removeSymbols(subs[i].Chosen);
  subs[i].password = removeSymbols(subs[i].password);
}

function removeSymbols(s: string) {
  return s.replace(/[\{\}]/g, "").split(":")[1];
}

result

[
  {
    "subjectID": 1,
    "Chosen": "Python,java,Angular",
    "password": "123456abcd"
  },
  {
    "subjectID": 2,
    "Chosen": "SQL,Rprogram,React",
    "password": "987654zyxwv"
  }
]

Welcome, is your object properties special characters limited to '{', ':', '}', if so, I propose to you the bellow solution, that I have tried and give a result as the one you have expected:

let objs = [
    {
        subjectID: 1,
        Chosen: "{subjectsChosen:Python,java,Angular}",
        password: "{studentpw:123456abcd}"
    },
    {
        subjectID: 2,
        Chosen: "{subjectsChosen:SQL,Rprogram,React}",
        password: "{studentpw:987654zyxwv}",
    }
];

objs.forEach((cur) => {
    Object.keys(cur).forEach(key => {
        if (typeof cur[key] === 'string') {
            cur[key]=cur[key].replace(/[\{\}]/g, '').split(':')[1];
        }
    })
});

console.log(objs);

You could use any array operator function other than forEach.

We could use map operator of Array here to transform each item. To transform Chosen and password fields, we could use Regex and replace method of string.

const chosenRegex = new RegExp(/\{subjectsChosen:(.+)\}/, 'i')
const myText = "{subjectsChosen:Python,java,Angular}";

myText.replace(re, '$1'); // Python,java,Angular

Below is the full implementation that transform each item.

const items = [
 {
   "subjectID": 1,
   "Chosen" : "{subjectsChosen:Python,java,Angular}",
   "password": "{studentpw:123456abcd}"
 },
 {
   "subjectID": 2,
   "Chosen" : "{subjectsChosen:SQL,Rprogram,React}",
   "password": "{studentpw:987654zyxwv}"
 }
];

const chosenRegex = new RegExp(/\{subjectsChosen:(.+)\}/, 'i')
const passwordRegex = new RegExp(/\{studentpw:(.+)\}/, 'i')

const transformedItems = items.map(item => {
    return {
      ...item,
      "Chosen": item.Chosen.replace(chosenRegex, '$1'),
      "password": item.password.replace(passwordRegex, '$1')
    }
});

console.log(transformedItems);

We could also literally use a single regex if we don't want to differentiate them.

const transformRegex = new RegExp(/\{(.+):(.+)\}/, 'i');

....

return {
 ...item,
 "Chosen": item.Chosen.replace(transformRegex, '$2'), // Since there are two regex groups now, use $2
 "password": item.password.replace(transformRegex, '$2')
}