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+/* Returns the number of times a character occurs in a string */
+function numCount(arr, element) {
+	// numCount("hello, l") return 2l
+	var count = 0;
+	for (var i = 0; i<arr.length; i++){
+    	if (arr[i]===element) {
+		 	count++
+		}
+	}
+	return `${count}${element}`;
+}
+
+/* Uses numCount function to return run length encoding of all characters in a string  */
+function runLengthEncoding(str) {
+	// runLengthEncoding("Hello World") returns 1h1e3l2o1w1r1d
+	var stringArray = str.toLowerCase().replace(/[^a-z]/g,"").split("");
+	var uniqueStringArray = [... new Set(stringArray)]
+	return uniqueStringArray.map((a) => numCount(stringArray, a)).join("");
+}
+
+/* Reverses words in a sentence */
+function reverseSentence(str) {
+	// reverseSentence("Hello World") returns olleH dlroW
+	return str.split(" ").map(a => a.split("").reverse().join("")).join(" ");
+}
+
+/* Determines if a string is a pangram or not */
+function pangram(str) {
+	// If a set of the string has exactly 26 letters which are all the letters of the English alphabet, it's a pangram
+	const stringArray = str.toLowerCase().replace(/[^a-z]/g,"").split("");
+	const uniqueLetters = [... new Set(stringArray)];
+	return uniqueLetters.length === 26 ? "Pangram" : "Not pangram"
+}