1773. Count Items Matching a Rule

Problem Statement

Pattern:

---

Solution

public int countMatches (List<List<String>> items, String ruleKey, String ruleValue){
	// available properties
	String[] ruleKeys = {"type", "color", "name"};
	// find RuleKeyNo.
	int keyNo = 0;
	for (int i = 0; i < ruleKeys.length; i++)
		if(ruleKeys[i].equals(ruleKey)) {
			keyNo = i;
			break;
		}
 
	// Check which item satisfies the rulevalue
	for (int itemNo = 0; itemNo < items.size(); itemNo++) {
		List<String> item = items.get(itemNo);
		if(item.get(keyNo).equals(ruleValue))
			return itemNo;
	}
	
	// element not found
	return -1;
}

Notes

• Make sure to use .equals() and not ==