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 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).