Hash Library Challenge - This project presents the construction of a library using only javascript to perform the advance calculation of installments in a given sale.

The project does not use any features like Reatc, Vue, Angular, Polymer, etc. Only Javascript with Polyfill is used.

The following methods are available:

• calcHashAnticipationDefault

Performs the default calculation for the advance periods previously defined on the later day, 15, 30, and 90 days.

• Call Example: calcHashAnticipationDefault(3, 4, 150) calcHashAnticipationDefault(installments, mdrPercentage, grossValue)

• installments - Identifies the number of installments to be considered in the calculation.
• mdrPercentage - Identifies the MDR percentage that will be used to calculate the discount.
• grossValue - Amount of the total over which the anticipation will be applied.

• Return Example:

 [
   { anticipationDate: "tomorrow", discountedInstallment: "132.67" },
   { anticipationDate: "15 days", discountedInstallment: "135.36" },
   { anticipationDate: "30 days", discountedInstallment: "138.24" },
   { anticipationDate: "90 days", discountedInstallment: "144.00" } 
 ]

• calcGenericAnticipationToObject

Performs the calculation for any advance date, displaying the result in the structure of an object, only for the requested period.

• Call Example: calcGenericAnticipationToObject(3, 4, 150, 15) calcGenericAnticipationToObject(installments, mdrPercentage, grossValue, numberOfDays)

• installments - Identifies the number of installments to be considered in the calculation.
• mdrPercentage - Identifies the MDR percentage that will be used to calculate the discount.
• grossValue - Amount of the total over which the anticipation will be applied.
• numberOfDays - Specifies the period (number of days) that will be used as a reference for the anticipation calculation.

• Return Example:

 [
 { anticipationDate: 15, discountedInstallment: "135.36" }
]

• calcGenericAnticipationToNumber

Performs the calculation for any advance date, returning the result in numeric format.

• Call Example: calcGenericAnticipationToNumber(3, 4, 150, 15) calcGenericAnticipationToObject(installments, mdrPercentage, grossValue, numberOfDays)

• installments - Identifies the number of installments to be considered in the calculation.
• mdrPercentage - Identifies the MDR percentage that will be used to calculate the discount.
• grossValue - Amount of the total over which the anticipation will be applied.
• numberOfDays - Specifies the period (number of days) that will be used as a reference for the anticipation calculation.

• Return Example:

 135.36

• calcGenericAnticipationToNumber

Performs the calculation of a value subtracted from a certain percentage by returning an object with information of the original value, the discount percentage, and the amount already discounted.

• Call Example: calcDiscountPercentage(10, 150) calcDiscountPercentage(mdrPercentage, grossValue)

• mdrPercentage - Identifies the MDR percentage that will be used to calculate the discount.
• grossValue - Amount of the total over which the anticipation will be applied.

• Return Example:

[
 { originalValue: 150, percentage: 10, discountedValue: 135 }
]

Installing / Getting started

To start in your node server:

• Instal Node.js, see instructions

• To start your Node server:

  • Install dependencies with: npm install
  • Generate library in / lib directory: npm run build
  • To use in your project perform the following import:

import {
    calcGenericAnticipationToNumber,
    calcHashAnticipationDefault,
    calcDiscountPercentage,
    calcGenericAnticipationToJson
} from 'hash-anticipation-calc-library'

Developing

Built With

The following dependencies were used:

    "devDependencies": {
    "@babel/core": "^7.3.4",
    "@babel/plugin-proposal-class-properties": "^7.3.4",
    "@babel/preset-env": "^7.3.4",
    "babel-eslint": "^10.0.1",
    "babel-loader": "^8.0.5",
    "eslint": "^5.15.0",
    "eslint-config-standard": "^12.0.0",
    "eslint-plugin-import": "^2.16.0",
    "eslint-plugin-node": "^8.0.1",
    "eslint-plugin-promise": "^4.0.1",
    "eslint-plugin-standard": "^4.0.0",
    "jest": "^24.1.0",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.2.3"
  }
  "dependencies": {
    "@babel/plugin-transform-arrow-functions": "^7.7.4",
    "@babel/plugin-transform-runtime": "^7.7.4",
    "@babel/polyfill": "^7.7.0",
    "@babel/runtime": "^7.7.6"
  }

All of which are automatically installed with the command:

npm install

Prerequisites

What is needed to set up the dev environment.

• Instal Node.js, see instructions

Setting up Dev

Here's a brief intro about what a developer must do in order to start developing the project further:

git clone https://github.com/orlandopamplona/hash-anticipation-calc-library
cd hash-anticipation-calc-library
npm install
npm run build

Deploying / Publishing

npm run build

Its library is already available in the npm repository to install using:

npm install hash-anticipation-calc-library

Running tests

Run the following command:

npm run test

The tests were implemented using jest