Glasgow | 25-ITP-SEP | Hanna Mykytiuk | Sprint 1 | Coursework

Sprint-1/fix/median.js

@@ -6,9 +6,22 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)){ //check if variable is array
+    return null;
+  }
+  const numbersOnly = list.filter(item => typeof item === "number" && !isNaN(item));
+  if (numbersOnly.length == 0){
+    return null;
+  }
+  const sorted =[...numbersOnly].sort((a,b) => a-b ); //we created a new arrey where we saved sorted element (as string) and turned them to numbers.
+
+  const middleIndex = Math.floor(sorted.length / 2);
+  if (sorted.length % 2 !== 0){ //for odds length of arrey
+    return sorted[middleIndex]
+  }
+  else{
+    return (sorted[middleIndex -1] + sorted[middleIndex]) / 2; //for even length of arrey
+  }
 }
 
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,10 @@
-function dedupe() {}
+function dedupe(array) {
+    if (array.length == 0){ // check if array is empty
+        return [];
+    }
+   let mySet = new Set(array); // create set mySet
+   let dedupeArray = Array.from (mySet); // create new array from the set mySet
+   return dedupeArray;
+}
+
+module.exports = dedupe;

Sprint-1/implement/dedupe.test.js

@@ -16,12 +16,29 @@ E.g. dedupe([1, 2, 1]) target output: [1, 2]
 // Given an empty array
 // When passed to the dedupe function
 // Then it should return an empty array
-test.todo("given an empty array, it returns an empty array");
+test("given an empty array, it returns an empty array", () => {
+  const currentOutput = dedupe([]);
+  const targetOutput = [];
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with no duplicates
 // When passed to the dedupe function
 // Then it should return a copy of the original array
-
+test("given an array with no duplicates, it should return a copy of the original array", () => {
+  const currentOutput = dedupe([5, 1, 2, 3, 8]);
+  const targetOutput = [5, 1, 2, 3, 8];
+  expect(currentOutput).toEqual(targetOutput);
+});
 // Given an array with strings or numbers
 // When passed to the dedupe function
 // Then it should remove the duplicate values, preserving the first occurence of each element
+test("given an array with strings or number, it should remove the duplicate values, preserving the first occurence of each element", () => {
+  const currentOutput = dedupe([5, "1", "1", 5, 8]);
+  const targetOutput = [5, "1", 8];
+
+  console.log(currentOutput);
+  console.log(targetOutput);
+
+  expect(currentOutput).toEqual(targetOutput);
+});

Sprint-1/implement/max.js

@@ -1,4 +1,19 @@
 function findMax(elements) {
+    //filter array for numbersOnly
+    const numbersOnly = elements.filter(item => !isNaN(item));
+    if (numbersOnly.length == 0){ // check if array is empty
+        return -Infinity;
+    }
+    if (numbersOnly.length === 1){ //check if they has one element
+        return numbersOnly[0];
+    }
+    let max = numbersOnly[0];// find a max number
+    for (let i=1; i<numbersOnly.length; i++){
+        if (numbersOnly[i]> max){
+            max = numbersOnly[i];
+        }
+    }
+    return max;
 }
 
 module.exports = findMax;

Sprint-1/implement/max.test.js

@@ -16,28 +16,63 @@ const findMax = require("./max.js");
 // When passed to the max function
 // Then it should return -Infinity
 // Delete this test.todo and replace it with a test.
-test.todo("given an empty array, returns -Infinity");
+
+test("given an empty array, it should return -Infinity", () => {
+  const currentOutput = findMax([]);
+  const targetOutput = -Infinity;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with one number
 // When passed to the max function
 // Then it should return that number
+test("Given an array with one number, it should return that number", () => {
+  const currentOutput = findMax([1]);
+  const targetOutput = 1;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with both positive and negative numbers
 // When passed to the max function
 // Then it should return the largest number overall
+test("Given an array with both positive and negative numbers it should return the largest number overall", () => {
+  const currentOutput = findMax([-2, 2, 3, -3]);
+  const targetOutput = 3;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with just negative numbers
 // When passed to the max function
 // Then it should return the closest one to zero
+test("Given an array with just negative numbers, it should returnthe closest one to zero", () => {
+  const currentOutput = findMax([-1, -2, -3, -4]);
+  const targetOutput = -1;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with decimal numbers
 // When passed to the max function
 // Then it should return the largest decimal number
+test("given an array with decimal numbers, it should return the largest decimal number", () => {
+  const currentOutput = findMax([0.2, 0.45, 5.3, 1.5]);
+  const targetOutput = 5.3;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with non-number values
 // When passed to the max function
 // Then it should return the max and ignore non-numeric values
+test("given an array with non-number values, it should return the max and ignore non-numeric values", () => {
+  const currentOutput = findMax(["a", "!", 3, 5, "0"]);
+  const targetOutput = 5;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // 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
+test("given an array with only non-number values, it should return the least surprising value given how it behaves for all other inputs", () => {
+  const currentOutput = findMax(["2", "3", "$", "%"]);
+  const targetOutput = "3";
+  expect(currentOutput).toEqual(targetOutput);
+});

Sprint-1/implement/sum.js

@@ -1,4 +1,21 @@
 function sum(elements) {
+    if (elements.length == 0){ // check if array is empty
+        return 0;
+    }
+     if (elements.length === 1){ //check if array has one element
+        return elements[0];
+    }
+    let sum = 0;
+    let isNumbersPresent = elements.some(item => typeof item === 'number' && !isNaN(item));
+    for (let i =0; i<elements.length; i++){ //sum of elements
+        if (typeof elements[i] === 'number'){ //check if element is number
+            sum += elements[i];
+        }
+        if (isNumbersPresent == false && !isNaN(elements[i])){ //1) check if array doesnt have numbers; 2)check if element can be conversted to number
+            sum += parseFloat(elements[i]); // add converted to num element
+        }
+    }
+    return sum
 }
 
 module.exports = sum;

Sprint-1/implement/sum.test.js

@@ -6,31 +6,61 @@ E.g. sum([10, 20, 30]), target output: 60
 E.g. sum(['hey', 10, 'hi', 60, 10]), target output: 80 (ignore any non-numerical elements)
 */
 
-const sum = require("./sum.js");
+const sum = require("./sum.js"); 
 
 // Acceptance Criteria:
 
 // Given an empty array
 // When passed to the sum function
 // Then it should return 0
-test.todo("given an empty array, returns 0")
+
+test("given an empty array, it should return 0", () => {
+  const currentOutput = sum ([]);
+  const targetOutput = 0;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with just one number
 // When passed to the sum function
 // Then it should return that number
+test("given an array with just one number, it should return that number", () => {
+  const currentOutput = sum ([1]);
+  const targetOutput = 1;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array containing negative numbers
 // When passed to the sum function
 // Then it should still return the correct total sum
+test("given an array containing negative numbers, it should still return the correct total sum", () => {
+  const currentOutput = sum ([-2, -3, -4, -5]);
+  const targetOutput = -14;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // Given an array with decimal/float numbers
 // When passed to the sum function
 // Then it should return the correct total sum
+test("given an array with decimal/float numbers, it should return the correct total sum", () => {
+  const currentOutput = sum ([2.5, 3.1, 4.9]);
+  const targetOutput = 10.5;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // 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
+test("given an array containing non-number values, it should return the sum of the numerical elements", () => {
+  const currentOutput = sum (["a", "!", 3, 5, ","]);
+  const targetOutput = 8;
+  expect(currentOutput).toEqual(targetOutput);
+});
 
 // 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
+test("given an array with only non-number values, it should return the least surprising value given how it behaves for all other inputs", () => {
+  const currentOutput = sum (["a", "!", "3", "5", ","]);
+  const targetOutput = 8;
+  expect(currentOutput).toEqual(targetOutput);
+});

Sprint-1/refactor/includes.js

@@ -1,9 +1,8 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
-    if (element === target) {
+  for(const element of list){
+     if (element === target) {
       return true;
     }
   }