Skip to content

[6-team] 정 8주차 과제 제출합니다 #45

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: 6-team
Choose a base branch
from
Open

[6-team] 정 8주차 과제 제출합니다 #45

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
5aaafe5
feat: create a unique method by iteration
jlee0505 Feb 1, 2023
0502245
feat: create groupBy method by iteration
jlee0505 Feb 1, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
42 changes: 26 additions & 16 deletions src/utils/groupBy.test.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,46 +2,56 @@

// 어떤 것을 해볼까요?
const groupBy = (arr, callback) => {
return arr;
return arr.reduce((acc, val) => {
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

reduce도 for..of 처럼 iterator로 돌아가나요?!

const key = callback(val);

if (acc[key] === undefined) acc[key] = [];

acc[key].push(val);
return acc;
}, {});
};

describe('groupBy 테스트', () => {
describe('non-lazy', () => {
it('case: 1, Normal', () => {
describe("groupBy 테스트", () => {
describe("non-lazy", () => {
it("case: 1, Normal", () => {
const array = [6.1, 4.2, 6.3];
const grouped = groupBy(array, Math.floor);

expect(grouped).toEqual({ 4: [4.2], 6: [6.1, 6.3] });
});

it('case: 2, Advanced', () => {
it("case: 2, Advanced", () => {
const array = [
[1, 'a'],
[2, 'a'],
[2, 'b'],
[1, "a"],
[2, "a"],
[2, "b"],
];

// 두 번째 인자가 index
const [groupedFirstIndex, groupedSecondIndex] = [groupBy(array, 0), groupBy(array, 1)];
const [groupedFirstIndex, groupedSecondIndex] = [
groupBy(array, 0),
groupBy(array, 1),
];

expect(groupedFirstIndex).toEqual({
1: [[1, 'a']],
1: [[1, "a"]],
2: [
[2, 'a'],
[2, 'b'],
[2, "a"],
[2, "b"],
],
});

expect(groupedSecondIndex).toEqual({
a: [
[1, 'a'],
[2, 'a'],
[1, "a"],
[2, "a"],
],
b: [[2, 'b']],
b: [[2, "b"]],
});
});

it('case: 3, Advanced', () => {
it("case: 3, Advanced", () => {
const grouped = groupBy({ a: 6.1, b: 4.2, c: 6.3 }, Math.floor);

expect(grouped).toEqual({ 4: [4.2], 6: [6.1, 6.3] });
Expand Down
16 changes: 10 additions & 6 deletions src/utils/unique.test.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,16 @@

// 어떤 것을 해볼까요?
const unique = (arr, callback, isSorted) => {
return arr;
const result = arr.reduce((acc, v) => {
return acc.includes(v) ? acc : [...acc, v];
}, []);

return result;
};

describe('unique 테스트', () => {
describe('non-lazy', () => {
it('case: 1, Normal', () => {
describe("unique 테스트", () => {
describe("non-lazy", () => {
it("case: 1, Normal", () => {
const [firstArray, secondArray] = [
[2, 1, 2],
[1, 2, 1],
Expand All @@ -19,7 +23,7 @@ describe('unique 테스트', () => {
expect(secondUniqueArray).toEqual([1, 2]);
});

it('case: 2, Advanced', () => {
it("case: 2, Advanced", () => {
const [firstArray, secondArray, thirdArray] = [
[1, 2, 3],
[1, 1, 2, 2, 3],
Expand All @@ -34,7 +38,7 @@ describe('unique 테스트', () => {
expect(thirdUniqueArray).toEqual([1, 2, 3]);
});

it('case: 3, Advanced', () => {
it("case: 3, Advanced", () => {
const objects = [
{ x: 1, y: 2 },
{ x: 2, y: 1 },
Expand Down