Backend Assignment

Commands

## 安裝
$ yarn

## 直接跑，預設讀取 .env -> .env.development
$ yarn start

## 調整 MAX_CLAIMABLE_SEASONS 參數後執行
$ MAX_CLAIMABLE_SEASONS=999 yarn start

## 單元測試
$ yarn test

Profit-sharing system

Assuming we need to share our profit with massive investors.

• We share profit per season. Investors with shareholding can claim their season profit after the season has ended.

• During each season, we may addProfit one or more times.

• Investors can invest, withdraw many times during a season, but we only consider the share status at the end of the season.

• The season profit will expire in MaxClaimableSeason seasons

Requirements

• There is a implemented function getCurrentSeason()

• Support different MaxClaimableSeason.

• Support invest, addProfit, withdraw, and claim methods.

• Add unit tests to increase confidence in the correctness of your implementation

• Write necessary comments to help readers understand the code.

• Write a README file with step-by-step instructions on how to build and run the tests

• Choose one of Golang, Python, C, C++, TypeScript, JavaScript, or Solidity as your implementation language

• Assume we have infinite precision with your number type (double, float, number…, etc)

Example

// Suppose MaxClaimableSeason = 1

// Season 1

invest 10 	by Steve

addProfit 20

invest 15 	by Dave

addProfit 30

invest 25 	by Dave

claim 		by Dave  // Receives nothing

// Steve: 10, Dave: 40, profit: 50

// Season 2

claim 		by Dave  // Receives 40



// Season 3

invest 20 	by Steve

claim 		by Steve // Receives nothing, no profit from season 2, profit from season 1 has expired

addProfit 35

// Steve: 30, Dave: 40, profit: 35

// Season 4

claim 		by Steve // Receives 15

claim 		by Dave  // Receives 20