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SimplifyStartsWith

SimplifyStartsWith

Since it passes in a literal of length 1, calls to (string).startsWith can be rewritten using (string).charAt(0) at the expense of some readability.



//PrimaryExpression
 [PrimaryPrefix/Name
  [ends-with(@Image, '.startsWith')] or PrimarySuffix[@Image='startsWith']]
 [PrimarySuffix/Arguments/ArgumentList
  /Expression/PrimaryExpression/PrimaryPrefix
  /Literal
   [string-length(@Image)=3]
   [starts-with(@Image, '"')]
   [ends-with(@Image, '"')]
 ]
 

Example(s):


  
public class Foo {

	boolean checkIt(String x) {
		return x.startsWith("a");	// suboptimal
	}
  
	boolean fasterCheckIt(String x) {
		return x.charAt(0) == 'a';	//	faster approach
	}
}