Question

I have an array with inside strings of numbers only and letters only, i.e.:

"10.1",
"15.7",
"9.3",
"RED",
"7.7",
"BLUE",
"9.0"

the [array count] returns the numbers of all strings in the array (in this examples 7).

How can I get the count of the strings which contain numbers only?

Thanks,

Max

Answer 1

Using blocks, this creates a set of array indexes for all strings in the array that contain a decimal digit.

[[items indexesOfObjectsPassingTest: ^(id obj, NSUInteger idx, BOOL *stop) {
     return (BOOL) [obj rangeOfCharacterFromSet: [NSCharacterSet decimalDigitCharacterSet]].length; 
 }] count]