Added isPandigital function

StringAlgorithms.ts

@@ -1,7 +1,7 @@
 //typescriptClasses/StringAlgorithms.ts
 //Matthew Ellison
 // Created: 07-13-21
-//Modified: 07-13-21
+//Modified: 10-11-21
 //Algorithms for strings
 /*
 	Copyright (C) 2021  Matthew Ellison
@@ -75,7 +75,7 @@ export function isPalindrome(str: string): boolean{
 }
 
 //This function returns the number of times the character occurs in the string
-export function findNumOccurrence(str: string, ch: string){
+export function findNumOccurrence(str: string, ch: string): number{
 	let num: number = 0;	//Set the number of occurrences to 0 to start
 	//Loop through every character in the string and compare it to the character passed in
 	for(let strCh of str){
@@ -86,4 +86,31 @@ export function findNumOccurrence(str: string, ch: string){
 	}
 	//Return the number of times the character appeared in the string
 	return num;
+}
+
+//Returns true if the string passed to it is a pandigital
+export function isPandigitalFull(str: string, bottom: number, top: number): boolean{
+	//Return false if top < bottom
+	if(top < bottom){
+		return false;
+	}
+
+	//Return false if the wrong number of characters are in the string
+	if(str.length != (top - bottom + 1)){
+		return false;
+	}
+
+	//Make sure that all of the needed characters are in the string exactly one time
+	for(let cnt = bottom;cnt <= top;++cnt){
+		//Make sure there is exactly one of this number contained in the string
+		if(findNumOccurrence(str, cnt.toString()) != 1){
+			return false;
+		}
+	}
+
+	//If the function has reached this part is has passed all of the falsifying tests
+	return true;
+}
+export function isPandigital(str: string): boolean{
+	return isPandigitalFull(str, 1, 9);
 }