# Electrum utilities

React components which work with Electrum might need some of the functionality
provided by these utility functions.

* `getInstanceMethodNames (obj, stop)` → gets an array of method names by walking
  `obj`'s prototype chain until (optional) prototype `stop` is reached.  
  See [Enumerating methods on a JavaScript class instance](http://code.fitness/post/2016/01/javascript-enumerate-methods.html)
  for a discussion on how this works.

* `getTextSelection (element)` → gets the selection as an object containing
  a `from` and a `to` position. Example selection: `{from: 3, to: 8}`. Cursor
  position without selection: `from: 3, to: 3}`.

* `shallowEqual (objA, objB)` → returns `true` if both objects contain the
  same keys and values (the comparison is done by reference equality).

* `startsWithLowerCase (string)` → returns `true` if the text starts with a
  lower case character (**a-z**, no accented characters).

* `startsWithUpperCase (string)` → returns `true` if the text starts with an
  upper case character (**A-Z**, no accented characters).