String starts with anything in a set<String>?

I want to see if any of the strings I pass(num) starts with any of the values on my set

Ex. String num = 456987533;

Set<String> numValidator = new Set<String>‘456’,’312’,762’;


Since my num starts with ‘456’ it should come back true.

How can I write this out?

StartsWith does not work because it is only comparing a string and not a set

1 Answer
1

Unless all of your String prefixes are the same length, you'll need to iterate over the contents of your Set.

for (String s : numValidator)
if (myInputString.startsWith(s))
// do something




However, if all of your prefixes are exactly three characters, you can handle this more simply and make use of Set membership constant-time checking:

Set<String> numValidator = new Set<String>'456','312','762';
String myInputString = '312456';

if (numValidator.contains(myInputString.left(3)))
System.debug('Found it');



numValidator

Required, but never shown

Required, but never shown

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