Function isWhiteSpace

Determines whether a string contains one or more white space characters and no other characters.

This implementation uses dotnet's Char.IsWhiteSpace definition of white space:

/^[\u000C\u000A\u000D\u0009\u000B\u0020\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\u0085]+$/.test(
  ch,
);
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Note: This differs from /\s/.test(ch) (usually considered the determiner of what is white space in JavaScript) in that it does not include ZWNBSP (U+FEFF) but rather includes NEXT LINE (U+0085)