Remove all occurrences of a substring from a string

remove-substring.js

function removeSubstring(string, substring) {
  let result = string;
  if (substring) {
    let index = result.indexOf(substring);
    while (index >= 0) {
      result = result.substring(0, index) + result.substring(index + substring.length);
      index = result.indexOf(substring, index);
    }
  }
  return result;
}


function removeSubstrings(string, substrings) {
  return substrings.reduce(removeSubstring, string);
}


function replaceSubstring(string, substring, replacement) {
  let result = string;
  if (substring) {
    let index = result.indexOf(substring);
    while (index >= 0) {
      result = result.substring(0, index) + replacement + result.substring(index + substring.length);
      index = result.indexOf(substring, index + replacement.length);
    }
  }
  return result;
}