How to remove characters from an strings array item in Javascript?

April 14, 2022

I have like this strings in array.

const x = [
  'a',
  ': 99999999999999999999999999,',
  ':',
  'this, is 2 :)'
]

How can I remove : and , from second element like this?

const x = [
  'a',
  '99999999999999999999999999',
  ':',
  'this, is 2 :)'
]

I tried replace : and , to ''. But there are these characters in other elements. And I don’t want to remove it. Also I tried startWith(‘:’), but it becomes all [undefined,undefined,undefined,undefined].

const v = u.map((x) => {
  x.startsWith(':') ? x.replace(':', '') : x;
});

console.log('v', v);

>Solution :

You are getting undefined values because you are not returning anything inside your .map() (common mistake, been there, done that). This would fix it:

const v = u.map((x) => {
  return x.startsWith(':') ? x.replace(':', '') : x;
});

// Or even shorter
const v = u.map((x) => (x.startsWith(':') ? x.replace(':', '') : x);