enum/lib/indexOf.js

Enum is a javascript module that introduces the Enum Type. It works for node.js, in the browser and for deno.

export const indexOf = Array.prototype.indexOf || function (find, i /* opt */) {
  if (i === undefined) i = 0
  if (i < 0) i += this.length
  if (i < 0) i = 0
  for (var n = this.length; i < n; i++) {
    if (i in this && this[i] === find) { return i }
  }
  return -1
}