How to use splice on string in JavaScript

If you really want to use splice(), you can spread the string to an array, invoke splice() on the array, and join() the results back together:

const removeFromString = (s, x, y) => {
  const array = [...s];
  array.splice(x, y);
  return array.join('');
}

console.log(removeFromString('Elie', 2, 2));

Although this is not a great way but this is just to give you idea how things works in javascript.

1. You can't use splice on a string because it works for arrays as it doesn’t work on strings because strings are immutable (edit after
   Sebastian Simon's comment)

2. You can use split method to convert a string into array of characters.

3. You can use splice method on array of characters.

4. You can use join method to convert array of characters to make a string

let stringTitle = "Elie";   // string
let stringArray = stringTitle.split("");   // spliting string into array of characters
console.log(stringArray);
let subString = stringArray.splice(0,2).join("")  // using splice on array of characters and then join them to make a string
console.log(subString)  // output El

I would suggest using str.substring(0, 2); for this use case is a better option.

let stringExample = "Elie";
let substring = stringExample.substring(0, 2);
console.log(substring) // output El

I think this is what you want to do.

function removeFromString(string, start, count) {
    let str = string.split('');
    str.splice(start, count);
    return str.join('');
}

console.log(removeFromString('Elie', 2, 2));

Try this:

function removeFromString(str, start, end) {
  let arr = Array.from(str);
  arr.splice(start, end);
  return arr.join(String());
}

and then use:

removeFromString('Elie', 2, 2);

Try using following code you can get more info about slice here

let str = "Elie";
// pass start and end position to slice method ,it will not include end character like i is at 2nd position
console.log(str.slice(0, 2));