Validating a number
No longer was the number of telephone numbers required largely limited to the number of households, but many times over.
The continued strain on the pool of available numbers can only increase the likelihood of further changes.
Even international dialing codes, however, aren’t as straightforward as you may think.
The format can vary – 1, 43, 962 1868 are all valid codes.
You don't need to do that when i) using HTML 5 type="number" attribute, ii) and the step attribute is not specified, or its value is an integer The thousands and decimal separators might take different value in certain countries.
The following table introduces some popular values that are defined by various countries.
When a carrier runs out of one set of numbers – like, sadly, premium-rate – they simply introduce a new prefix.
If, by mistake, they enter letters or punctuation signs, the conversion into an integer will fail and generate an exception (error) and the program would stop running.
To validate the user entry and ensure that is a number it is possible to catch this exception when it occurs using the try…except…block as follows: See how we can use this approach to define our own function (called input Number()) to ask for a number.
The countries library contains a bunch of geographical information which includes international dialing codes.
Here is an excerpt from As you can see, this demonstrates that Austria uses the international dialing code 43. Well, using the magic of Lodash (or Underscore), there are a few ways in which we can query dialing code-related information.Explanation \\d = only digit allow = length All phone numbers must in “xxx-xxxxxxx” format.