how can i remove chars between indexes in a javascript string

Question

i have the following:

var S=\"hi how are you\";
var bindex = 2;
var eindex = 6;

how can i remove all the chars from S that reside between

Answer 1

A solution that doesn't require creating any intermediate arrays or strings is to use .replace to capture the first characters in a group, match the characters you want to remove, and replace with the first captured group:

// keep first 3 characters, remove next 4 characters
const s = "hi how are you";
console.log(
  s.replace(/(.{3}).{4}/, '$1')
);