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Author: Alex Jamshidi

Sprint-1/fix/median.js

@@ -6,13 +6,24 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  if (!Array.isArray(list)) {return null;} 
-  let numberArray = list.filter(n => Number.isFinite(n))
-  if (numberArray.length == 0) {return null};
-  numberArray.sort((a, b) => a - b)
+  if (!Array.isArray(list)) {
+    return null;
+  }
+  let numberArray = list.filter((n) => Number.isFinite(n));
+  if (numberArray.length == 0) {
+    return null;
+  }
+  numberArray.sort((a, b) => a - b);
 
-  if (numberArray.length % 2 == 1) {return numberArray[((numberArray.length - 1) / 2)]}
-  else {return (numberArray[((numberArray.length / 2))] + numberArray[((numberArray.length / 2) - 1)]) / 2}
+  if (numberArray.length % 2 == 1) {
+    return numberArray[(numberArray.length - 1) / 2];
+  } else {
+    return (
+      (numberArray[numberArray.length / 2] +
+        numberArray[numberArray.length / 2 - 1]) /
+      2
+    );
+  }
 }
 
 module.exports = calculateMedian;

Sprint-1/fix/median.test.js

@@ -13,7 +13,8 @@ describe("calculateMedian", () => {
     { input: [1, 2, 3, 4], expected: 2.5 },
     { input: [1, 2, 3, 4, 5, 6], expected: 3.5 },
   ].forEach(({ input, expected }) =>
-    it(`returns the median for [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`returns the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 
   [
@@ -24,7 +25,8 @@ describe("calculateMedian", () => {
     { input: [110, 20, 0], expected: 20 },
     { input: [6, -2, 2, 12, 14], expected: 6 },
   ].forEach(({ input, expected }) =>
-    it(`returns the correct median for unsorted array [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`returns the correct median for unsorted array [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 
   it("doesn't modify the input array [3, 1, 2]", () => {
@@ -33,8 +35,17 @@ describe("calculateMedian", () => {
     expect(list).toEqual([3, 1, 2]);
   });
 
-  [ 'not an array', 123, null, undefined, {}, [], ["apple", null, undefined] ].forEach(val =>
-    it(`returns null for non-numeric array (${val})`, () => expect(calculateMedian(val)).toBe(null))
+  [
+    "not an array",
+    123,
+    null,
+    undefined,
+    {},
+    [],
+    ["apple", null, undefined],
+  ].forEach((val) =>
+    it(`returns null for non-numeric array (${val})`, () =>
+      expect(calculateMedian(val)).toBe(null))
   );
 
   [
@@ -45,6 +56,7 @@ describe("calculateMedian", () => {
     { input: [3, "apple", 1, null, 2, undefined, 4], expected: 2.5 },
     { input: ["banana", 5, 3, "apple", 1, 4, 2], expected: 3 },
   ].forEach(({ input, expected }) =>
-    it(`filters out non-numeric values and calculates the median for [${input}]`, () => expect(calculateMedian(input)).toEqual(expected))
+    it(`filters out non-numeric values and calculates the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
   );
 });

Sprint-1/implement/dedupe.js

@@ -1,11 +1,11 @@
 function dedupe(array) {
-    const unique = [];
-    array.forEach((item) => {
-        if (!unique.includes(item)) {
-            unique.push(item);
-        }
-    });
-    return unique
+  const unique = [];
+  array.forEach((item) => {
+    if (!unique.includes(item)) {
+      unique.push(item);
+    }
+  });
+  return unique;
 }
 
-module.exports = dedupe;
+module.exports = dedupe;

Sprint-1/implement/max.js

@@ -1,7 +1,10 @@
 function findMax(list) {
-    const numbers = list.filter(n => Number.isFinite(n));
-    if (numbers.length == 0) { return "-Infinity"}
-    else {return Math.max(...numbers)};
+  const numbers = list.filter((n) => Number.isFinite(n));
+  if (numbers.length == 0) {
+    return "-Infinity";
+  } else {
+    return Math.max(...numbers);
+  }
 }
 
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -13,71 +13,67 @@ We have set things up already so that this file can see your function from the o
 const findMax = require("./max.js");
 
 describe("calculateMedian", () => {
-// Given an empty array
-// When passed to the max function
-// Then it should return -Infinity
-// Delete this test.todo and replace it with a test.
+  // Given an empty array
+  // When passed to the max function
+  // Then it should return -Infinity
+  // Delete this test.todo and replace it with a test.
 
   it("empty array returns -Infinity", () => {
     const list = [];
     expect(findMax(list)).toEqual("-Infinity");
   });
 
-// Given an array with one number
-// When passed to the max function
-// Then it should return that number
+  // Given an array with one number
+  // When passed to the max function
+  // Then it should return that number
 
   it("array with one number returns that number", () => {
     const list = [2];
     expect(findMax(list)).toEqual(2);
   });
 
-// Given an array with both positive and negative numbers
-// When passed to the max function
-// Then it should return the largest number overall
+  // Given an array with both positive and negative numbers
+  // When passed to the max function
+  // Then it should return the largest number overall
 
   it("array with +ve and -ve numbers, returns largest number overall", () => {
     const list = [10, -15];
     expect(findMax(list)).toEqual(10);
   });
 
-
-// Given an array with just negative numbers
-// When passed to the max function
-// Then it should return the closest one to zero
+  // Given an array with just negative numbers
+  // When passed to the max function
+  // Then it should return the closest one to zero
 
   it("array -ve numbers, returns closest to zero", () => {
     const list = [-1, -2, -3, -15];
     expect(findMax(list)).toEqual(-1);
   });
 
-
-// Given an array with decimal numbers
-// When passed to the max function
-// Then it should return the largest decimal number
+  // Given an array with decimal numbers
+  // When passed to the max function
+  // Then it should return the largest decimal number
 
   it("array with decimal numbers should return largest decimal number", () => {
     const list = [1.9, 2.8999, 3.1];
     expect(findMax(list)).toEqual(3.1);
   });
 
-
-// Given an array with non-number values
-// When passed to the max function
-// Then it should return the max and ignore non-numeric values
+  // Given an array with non-number values
+  // When passed to the max function
+  // Then it should return the max and ignore non-numeric values
 
   it("array with non-number values, returns the max and ignore non-numeric values", () => {
     const list = [1, "a", 2, "b", 3, "c"];
     expect(findMax(list)).toEqual(3);
   });
 
-
-// Given an array with only non-number values
-// When passed to the max function
-// Then it should return the least surprising value given how it behaves for all other inputs
+  // Given an array with only non-number values
+  // When passed to the max function
+  // Then it should return the least surprising value given how it behaves for all other inputs
 
   it("array with only non-number values, return the least surprising value given how it behaves for all other inputs", () => {
     const list = ["a", "b", "c"];
     expect(findMax(list)).toEqual("-Infinity");
   });
-});
+});

Sprint-1/implement/sum.js

@@ -1,8 +1,10 @@
 function sum(list) {
-    const numbers = list.filter(n => Number.isFinite(n));
-    let total = 0;
-    for (n of numbers) {total += n};
-    return total;
+  const numbers = list.filter((n) => Number.isFinite(n));
+  let total = 0;
+  for (n of numbers) {
+    total += n;
+  }
+  return total;
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -11,55 +11,55 @@ const sum = require("./sum.js");
 // Acceptance Criteria:
 
 describe("sum", () => {
-// Given an empty array
-// When passed to the sum function
-// Then it should return 0
+  // Given an empty array
+  // When passed to the sum function
+  // Then it should return 0
   it("empty array returns 0", () => {
     const list = [];
     expect(sum(list)).toEqual(0);
   });
 
-// Given an array with just one number
-// When passed to the sum function
-// Then it should return that number
+  // Given an array with just one number
+  // When passed to the sum function
+  // Then it should return that number
   it("array with one number returns number", () => {
     const list = [1];
     expect(sum(list)).toEqual(1);
   });
 
-// Given an array containing negative numbers
-// When passed to the sum function
-// Then it should still return the correct total sum
+  // Given an array containing negative numbers
+  // When passed to the sum function
+  // Then it should still return the correct total sum
 
   it("array with negative numbers returns correct sum", () => {
     const list = [-1, -2, -3];
     expect(sum(list)).toEqual(-6);
   });
 
-// Given an array with decimal/float numbers
-// When passed to the sum function
-// Then it should return the correct total sum
+  // Given an array with decimal/float numbers
+  // When passed to the sum function
+  // Then it should return the correct total sum
 
   it("array with decimal numbers returns correct sum", () => {
     const list = [1.1, 2.2, 3.3];
     expect(sum(list)).toEqual(6.6);
   });
 
-// Given an array containing non-number values
-// When passed to the sum function
-// Then it should ignore the non-numerical values and return the sum of the numerical elements
+  // Given an array containing non-number values
+  // When passed to the sum function
+  // Then it should ignore the non-numerical values and return the sum of the numerical elements
 
   it("array with non-number values returns sum of numerical values only", () => {
     const list = [1, 2, "apple", 4, "banana", 3];
     expect(sum(list)).toEqual(10);
   });
 
-// Given an array with only non-number values
-// When passed to the sum function
-// Then it should return the least surprising value given how it behaves for all other inputs
+  // Given an array with only non-number values
+  // When passed to the sum function
+  // Then it should return the least surprising value given how it behaves for all other inputs
 
   it("array with non-number values only returns least surprising output", () => {
     const list = ["a", "b", "c"];
     expect(sum(list)).toEqual(0);
   });
-});
+});

Sprint-1/refactor/includes.js

@@ -1,13 +1,16 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-for (item of list) {if (item === target) {return true;}}
-    return false;
+  for (item of list) {
+    if (item === target) {
+      return true;
+    }
+  }
+  return false;
 }
 
 module.exports = includes;
 
-
 /* Old code:
 
   for (let index = 0; index < list.length; index++) {