Making a function using .replace() to remove multiple characters in a variable string?

Question

The function accepts 3 inputs: (string (str), starting point in string (index), and how many characters to remove after that (count)).

function removeFromString(str, index, count) {
  let newStr = '';
  for (let i = index; i <= (index + count); i++) {
    newStr = str.replace(str[i], '');
  }
  return newStr;
}

It's returning outputs that may remove one character at most, but nothing more than that, which is not what I am trying to achieve.

What I want is a function that when called, will return a function without the characters specified from the index and count parameters.

CertainPerformance · Accepted Answer · 2022-06-26 02:03:46Z

1

With

newStr = str.replace(str[i], '')

you're always taking str as the base string to replace - which is the original input. You're never using the newStr except after the final iteration; all replacements made before then are lost.

Another problem is that str.replace(str[i], '') will replace the same character if it exists earlier in the string, rather than at the index you want.

Slice the string's indicies instead.

const removeFromString = (str, index, count) => (
  str.slice(0, index + 1) + str.slice(index + count + 1)
);
console.log(removeFromString('123456', 2, 2));

edited Jun 26, 2022 at 2:03

answered Jun 26, 2022 at 1:50

CertainPerformance

374k55 gold badges354 silver badges359 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Andy Over a year ago

Shouldn't that second example return 1236?

Rohìt Jíndal · Accepted Answer · 2022-06-27 06:31:17Z

1

Is just a matter of use substring method from JS.

Substring method definition from Mozilla Developer Network

    function removeFromString(str, index, count) {
       return str.substring(0, index) + str.substring(index+count);
    }
    console.log(removeFromString('fofonka', 2, 2));

edited Jun 27, 2022 at 6:31

Rohìt Jíndal

27.3k16 gold badges80 silver badges133 bronze badges

answered Jun 26, 2022 at 2:23

user3776401

291 silver badge3 bronze badges

Collectives™ on Stack Overflow

Making a function using .replace() to remove multiple characters in a variable string?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related