Challenge ten

chainingMethods/challenges-10.test.js

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+
+'use strict';
+
+// ------------------------------------------------------------------------------------------------
+// CHALLENGE 1
+//
+// Write a function named count that, given an integer and an array of arrays, uses either
+// filter, map, or reduce to count the amount of times the integer is present in the array of arrays.
+//
+// Note: You might need to use the same method more than once.
+//
+// For example, count(5, [[1, 3, 5, 7, 9], [5, 5, 5], [1, 2, 3]]) returns 4.
+// ------------------------------------------------------------------------------------------------
+
+const count = (target, input) => {
+  // Solution code here...
+};
+
+// ------------------------------------------------------------------------------------------------
+// CHALLENGE 2
+//
+// Write a function that, given an array of integer arrays as input, either filter, map, or reduce
+// to calculate the total sum of all the elements in the array.
+//
+// Note: You might need to use the same method more than once.
+// ------------------------------------------------------------------------------------------------
+
+const totalSum = (input) => {
+  // Solution code here...
+};
+
+// ------------------------------------------------------------------------------------------------
+// CHALLENGE 3
+
+// Write a function named divisibleByFiveTwoToThePower that accpets an array of arrays as input.
+//
+// This function should first remove any elements that are not numbers or are not divisible by five.
+//
+// This function should then raise 2 to the power of the resulting numbers, returning an array of arrays.
+//
+// For example, [ [0,2,5,4], [2,4,10], [] ] should return [ [1, 32], [1024], [] ].
+// ------------------------------------------------------------------------------------------------
+
+const divisibleByFiveTwoToThePower = (input) => {
+  // Solution code here...
+};
+
+// ------------------------------------------------------------------------------------------------
+// CHALLENGE 4
+//
+// Write a function named findMaleAndFemale that, given the Star Wars data, below,
+// returns the names of the characters whose gender is either male or female.
+//
+// The names should be combined into a single string with each character name separated by "and".
+//
+// For example, "C-3PO and Luke Skywalker".
+// ------------------------------------------------------------------------------------------------
+
+let starWarsData = [{
+  name: 'Luke Skywalker',
+  height: '172',
+  mass: '77',
+  hair_color: 'blond',
+  skin_color: 'fair',
+  eye_color: 'blue',
+  birth_year: '19BBY',
+  gender: 'male',
+},
+{
+  name: 'C-3PO',
+  height: '167',
+  mass: '75',
+  hair_color: 'n/a',
+  skin_color: 'gold',
+  eye_color: 'yellow',
+  birth_year: '112BBY',
+  gender: 'n/a'},
+{
+  name: 'R2-D2',
+  height: '96',
+  mass: '32',
+  hair_color: 'n/a',
+  skin_color: 'white, blue',
+  eye_color: 'red',
+  birth_year: '33BBY',
+  gender: 'n/a'
+},
+{
+  name: 'Darth Vader',
+  height: '202',
+  mass: '136',
+  hair_color: 'none',
+  skin_color: 'white',
+  eye_color: 'yellow',
+  birth_year: '41.9BBY',
+  gender: 'male'
+},
+{
+  name: 'Leia Organa',
+  height: '150',
+  mass: '49',
+  hair_color: 'brown',
+  skin_color: 'light',
+  eye_color: 'brown',
+  birth_year: '19BBY',
+  gender: 'female'
+}]
+
+let findMaleAndFemale = (data) => {
+  // Solution code here...
+}
+
+// ------------------------------------------------------------------------------------------------
+// CHALLENGE 5
+
+// Write a function named findShortest that, given the Star Wars data from challenge 6,
+// uses any combination of filter, map and reduce to return the name of the shortest character.
+//
+// ------------------------------------------------------------------------------------------------
+
+let findShortest = (data) => {
+  // Solution code here...
+}
+
+// ------------------------------------------------------------------------------------------------
+// TESTS
+//
+// All the code below will verify that your functions are working to solve the challenges.
+//
+// DO NOT CHANGE any of the below code.
+//
+// Run your tests from the console: jest challenges-10.test.js
+//
+// ------------------------------------------------------------------------------------------------
+
+describe('Testing challenge 1', () => {
+  test('It should return the number of times the input is in the nested arrays', () => {
+    expect(count(5, [[1, 3, 5, 7, 9], [5, 5, 5], [1, 2, 3]])).toStrictEqual(4);
+    expect(count(3, [[1, 3, 5, 7, 9], [5, 5, 5], [1, 2, 3]])).toStrictEqual(2);
+    expect(count(12, [[1, 3, 5, 7, 9], [5, 5, 5], [1, 2, 3]])).toStrictEqual(0);
+  });
+  test('It should work on empty arrays', () => {
+    expect(count(5, [[1, 3, 5, 7, 9], [], [5, 5, 5], [1, 2, 3], []])).toStrictEqual(4);
+    expect(count(5, [])).toStrictEqual(0);
+  })
+});
+
+describe('Testing challenge 2', () => {
+  test('It should add all the numbers in the arrays', () => {
+    const nums = [[1, 2, 3, 4, 5], [6, 7, 2, 4, 5, 7],[9, 2, 3, 6, ]];
+
+    expect(totalSum(nums)).toStrictEqual(66);
+  });
+});
+
+describe('Testing challenge 3', () => {
+  test('It should return numbers divisible by five, then raise two to the power of the resulting numbers', () => {
+    expect(divisibleByFiveTwoToThePower([[10, 20, 5, 4], [5, 6, 7, 9], [1, 10, 3]])).toStrictEqual([ [ 1024, 1048576, 32 ], [ 32 ], [ 1024 ] ]);
+  });
+
+  test('It should return an empty array if none of the numbers are divisible by five', () => {
+    expect(divisibleByFiveTwoToThePower([[1, 2, 3], [5, 10 , 15]])).toStrictEqual([ [], [ 32, 1024, 32768 ] ]);
+  });
+
+  test('It should return an empty array if the values are not numbers', () => {
+    expect(divisibleByFiveTwoToThePower([['one', 'two', 'five'], ['5', '10' , '15'], [5]])).toStrictEqual([ [], [], [ 32 ] ]);
+  });
+});
+
+describe('Testing challenge 4', () => {
+  test('It should return only characters that are male or female', () => {
+    expect(findMaleAndFemale(starWarsData)).toStrictEqual('Luke Skywalker and Darth Vader and Leia Organa');
+    expect(findMaleAndFemale([{name: 'person', gender: 'female'}, {gender: 'lol'}, {name: 'persontwo', gender: 'male'}])).toStrictEqual('person and persontwo');
+  });
+});
+
+describe('Testing challenge 5', () => {
+  test('It should return the shortest character', () => {
+    expect(findShortest(starWarsData)).toStrictEqual('Leia Organa');
+  });
+});