How to get numbers from strings

[ulrik]

I have a function that iterate over strings like

 strings = ["brass", "001", "127", "flute"]

How can I find the string numbers from this array?
I have tried "typeof", of course that's not going to work, eval(), etc....
I even tried to let all strings pass

Engine.getMidiNoteName(string)

and it log "0" for all letter strings but it works for the "number" strings
How do you do it?

[Oli Ullmann]

@ulrik
I'm not sure I fully understand your question, but there is String.getIntValue(). This function converts a string into an integer.

And there is Engine.getValueForText(String text, String convertedMode).

[ustk]

Use parseInt. But you need to check the charcode of the first character to get rid of letter parsing returning 0

const var strings = ["brass", "001", "127", "flute"];

for (s in strings)
{
	if (s.charCodeAt(0) >= 48 && s.charCodeAt(0) <= 57) // <= 0-9 numbers only
		Console.print(parseInt(s));
}

As @Oli-Ullmann said String.getIntValue() also works, I don't know if there's any difference between the two...

[dannytaurus]

@ulrik Or use regex to detect strings that only contains digits.

const var strings = ["brass", "001", "127", "flute"];

for (s in strings)
{
  if (Engine.matchesRegex(s, "^\\d+$")) Console.print(parseInt(s));
}

^ means 'start of string'
\\d means digit
+ means 'one or more'
$ means 'end of string`

So, "one or more digits between the start and end of the string, and nothing else"

[David Healey]

@ulrik said in How to get numbers from strings:

How can I find the string numbers from this array?

How did the numbers get into the array as strings?

[Orvillain]

@ulrik are you parsing dodgy data from somewhere?? Because grouping numbers and text strings like that into a single array seems like a poor design.