Implement functions to repeat strings, get ordinal numbers, and count; pass all test cases

Author: RomanSanaye

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,18 @@
+// our function;
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  if (!stringOfCharacters || !findCharacter) {
+    return 0;
+  }
+  let numberOfChar = 0;
+  for (let wantedChar of stringOfCharacters) {
+    if (wantedChar === findCharacter) {
+      numberOfChar++;
+    }
+    if (numberOfChar === 0) {
+     return `0 ${findCharacter} found.`
+    }
+  }
+  return numberOfChar;
 }
 
 module.exports = countChar;

Sprint-3/2-practice-tdd/count.test.js

@@ -22,3 +22,9 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 if there is not a character occurrence", () => {
+  const str = "aaaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(`0 ${char} found.`);
+});

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,19 @@
+// lets develop our function.
 function getOrdinalNumber(num) {
-  return "1st";
+  
+  const lastDigit = num % 10; // ==> 111 % 10 = 11.1 last digit is 1.
+  const lastTwoDigits = num % 100; // 111 % 100 = 111 last two digits 11.
+  
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13){
+    return `${num}th`;// ==> finds the last two digits to equal (11,12,13)
+  }
+  if(lastDigit == 1){
+    return `${num}st`;
+  }else if (lastDigit == 2){
+    return `${num}nd`;
+  }else if (lastDigit == 3){
+    return `${num}rd`;
+  } else return `${num}th`;
 }
 
 module.exports = getOrdinalNumber;

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,27 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(222)).toEqual("222nd");
+});
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(333)).toEqual("333rd");
+});
+test("should append 'th' for numbers ending with 4 and more than 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(44)).toEqual("44th");
+  expect(getOrdinalNumber(444)).toEqual("444th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+  expect(getOrdinalNumber(105)).toEqual("105th");
+});
+test("should append 'th' for numbers ending with 11, 12 and 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,5 +1,8 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0)
+    throw new Error("Negative counts are not valid");
+  if (count === 0) return "";
+  else return str.repeat(count);
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -10,23 +10,27 @@ const repeatStr = require("./repeat-str");
 // Then it should return a string that contains the original `str` repeated `count` times.
 
 test("should repeat the string count times", () => {
-  const str = "hello";
-  const count = 3;
-  const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatStr("Love", 3)).toEqual("LoveLoveLove");
 });
 
 // Case: handle count of 1:
 // Given a target string `str` and a `count` equal to 1,
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
-
+test("should print the original string", () => {
+  expect(repeatStr("Love", 1)).toEqual("Love");
+});
 // Case: Handle count of 0:
 // Given a target string `str` and a `count` equal to 0,
 // When the repeatStr function is called with these inputs,
 // Then it should return an empty string.
-
+test("should return an empty string", () => {
+  expect(repeatStr("Love", 0)).toEqual("");
+});
 // Case: Handle negative count:
 // Given a target string `str` and a negative integer `count`,
 // When the repeatStr function is called with these inputs,
 // Then it should throw an error, as negative counts are not valid.
+test("should throw and error when count is a negative number", () => {
+  expect(()=> repeatStr("Love", -3)).toThrow("Negative counts are not valid");
+});