Sprint 3 Practice TDD exercises

Author: arunkumarakilan

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

@@ -1,5 +1,12 @@
-function countChar(stringOfCharacters, findCharacter) {
-  return 5
+function countChar(str, char) {
+  let count = 0;
+  for (let i = 0; i < str.length; i++)
+  if(str[i] === char)
+  {
+    count++;
+  }
+  return count;
 }
 
+
 module.exports = countChar;

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

@@ -16,6 +16,12 @@ test("should count multiple occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
+test("should count no occurrences of a character",()=>{
+  const str = "hello";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
 
 // Scenario: No Occurrences
 // Given the input string `str`,

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

@@ -1,5 +1,19 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if( num%10 === 1 && num%100 !== 11)
+  {
+    return `${num}st`;
+  }
+  else if (num%10 === 2 && num%100 !== 12)
+  {
+    return `${num}nd`;
+  }
+  else if(num%10===3 && num%100 !==13)
+     {
+    return `${num}rd`;
+  }
+  else{
+    return `${num}th`;
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,43 @@ 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 'th' for numbers ending with 11", ()=>{
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(211)).toEqual("211th");
+   expect(getOrdinalNumber(311)).toEqual("311th");
+});
+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(132)).toEqual("132nd");
+});
+test("should append 'th' for numbers ending with 12", () => {
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(212)).toEqual("212th");
+});
+
+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(133)).toEqual("133rd");
+});
+test("should append 'th' for numbers ending with 13", () => {
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(213)).toEqual("213th");
+});
+test("should append 'th' for numbers ending with 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(134)).toEqual("134th");
+});
+
+
+
+
+
+
+
+

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

@@ -1,5 +1,26 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count <0)
+  {
+  throw new Error("negative counts are not valid");
+  }
+  else if(count === 1)
+  {
+    return str;
+  }
+  else if (count === 0)
+  {
+    return "";
+  }
+  else 
+  {
+    let result ="";
+    for (let i =0; i<count;i++)
+    {
+
+      result =result+str;
+    }
+    return result;
+  }
 }
 
 module.exports = repeatStr;

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

@@ -12,8 +12,23 @@ const repeatStr = require("./repeat-str");
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
-  const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatStr(str,count)).toEqual("hellohellohello");
+});
+test(" should return original 'str' without repetition", ()=>{
+  const str = "hello";
+  const count = 1;
+  expect(repeatStr(str, count)).toEqual("hello");
+});
+test("should return empty string", ()=>{
+  const str = "hello";
+  const count = 0;
+  expect(repeatStr(str, count)).toEqual("");
+
+});
+test("should throw negative counts are not valid Error", ()=>{
+const str = "hello";
+  const count = -1;
+  expect(()=> repeatStr(str, count)).toThrow();
 });
 
 // Case: handle count of 1: