London | 26-ITP-Sept | Hugh Mills | Sprint 2 | practice tdd

practice-tdd/count.js

@@ -1,3 +1,7 @@
-export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+export function countChar(str, char) {
+  let charMatch = str.match(new RegExp(char, "g"));
+  if (charMatch === null) {
+    return 0;
+  }
+  return charMatch.length;
 }

practice-tdd/count.test.js

@@ -22,3 +22,45 @@ 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 count 0 with no occurrences of a character", () => {
+  const str = "aaaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count 0 with no empty string", () => {
+  const str = "";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count multiple occurrences of a character in random string", () => {
+  const str = "accababaade";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(5);
+});
+
+test("should count multiple occurrences of a character in string with empty spaces", () => {
+  const str = "aa a  aa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(5);
+});
+
+test("should count multiple occurrences of a character in string ignoring upper case", () => {
+  const str = "aaAaaa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(5);
+});
+
+test("should count multiple occurrences of a character in string ignoring lower case", () => {
+  const str = "aAAaAAA";
+  const char = "A";
+  const count = countChar(str, char);
+  expect(count).toEqual(5);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,18 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  let numString = num.toString();
+  if (11 <= Number(numString.slice(-2)) && 19 >= Number(numString.slice(-2))) {
+    return numString + "th";
+  } else if (
+    -11 >= Number(numString.slice(-2)) &&
+    -19 <= Number(numString.slice(-2))
+  ) {
+    return numString + "th";
+  } else if (numString.slice(-1) === "1") {
+    return numString + "st";
+  } else if (numString.slice(-1) === "2") {
+    return numString + "nd";
+  } else if (numString.slice(-1) === "3") {
+    return numString + "rd";
+  }
+  return numString + "th";
 }

practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,33 @@ 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 11-19", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+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 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+
+test("should append 'th' for all other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(25)).toEqual("25th");
+  expect(getOrdinalNumber(137)).toEqual("137th");
+});
+
+test("should be giving correct endings for negative numbers", () => {
+  expect(getOrdinalNumber(-2)).toEqual("-2nd");
+  expect(getOrdinalNumber(-23)).toEqual("-23rd");
+  expect(getOrdinalNumber(-137)).toEqual("-137th");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,12 @@
-export function repeatStr() {
+export function repeatStr(str, count) {
   // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+  if (count < 0) {
+    throw new Error("negative counts are not valid");
+  }
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }

practice-tdd/repeat-str.test.js

@@ -8,8 +8,7 @@ import { repeatStr } from "./repeat-str.js";
 // Given a target string `str` and a positive integer `count` greater than 1,
 // When the repeatStr function is called with these inputs,
 // Then it should return a string that contains the original `str` repeated `count` times.
-
-test("should repeat the string count times", () => {
+test("should repeat the string count 3 times", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
@@ -20,13 +19,53 @@ test("should repeat the string count times", () => {
 // 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 repeat the string count 1 times", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
 
 // 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 repeat the string count 0 times", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+test("should repeat the empty string count 0 times", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+test("should repeat the space in string count 3 times", () => {
+  const str = " ";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("   ");
+});
+
+test("should repeat the symbols in string count 3 times", () => {
+  const str = "@%£$";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("@%£$@%£$@%£$");
+});
 
 // 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 an error 'negative counts are not valid'", () => {
+  const str = "hello";
+  const count = -3;
+  expect(() => repeatStr(str, count)).toThrow(
+    new Error("negative counts are not valid")
+  );
+});