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02-tools-and-context's Introduction

cf 02: Tools and Context

Submission Instructions

  • Work in a fork of this repository
  • Work in a branch on your fork
  • Write all of your code in a directory named lab- + <your name> e.g. lab-susan
  • Open a pull request to this repository
  • Submit on canvas a question and observation, how long you spent, and a link to your pull request

Configuration

Configure the root of your repository with the following files and directories. Thoughtfully name and organize any additional configuration or module files.

  • README.md - contains documentation
  • .gitignore - contains a robust .gitignore file
  • .eslintrc.json - contains the course linter configuratoin
  • .eslintignore - contains the course linter ignore configuration
  • package.json - contains npm package config
    • create a lint script for running eslint
    • create a test script for running tests
  • lib/ - contains module definitions
  • __test__/ - contains unit tests

Feature Tasks

FP Module

Create a module in the lib/ directory named fp.js that exports an object and it's associated methods. Create stand alone map, filter, reduce, and slice functions that use the call and apply function methods. In each function, error-check all parameters and throw an Error (with a meaningful message) if the function is invoked with invalid arguments. Do not use any third party libraries in the FP module - only use jest for testing.

Method Requirements
  • fp.map and fp.filter should have the function signature (callback, collection) => Array
  • fp.reduce should have the function signature (callback, initialState, collection) => data
  • fp.slice should have the function signature (begin, end, collection) => Array

Testing

FP Module Tests

Create a NodeJS module in the __test__/ directory named fp.test.js that asserts the correctness of the fp module.

  1. Use the describe and it (or test) methods to define descriptive tests and increase readablity
  2. Each it callback should aim to test a small, well defined, feature of a function - this may include:
  • tests that ensure the fp module functions correctly with error-check parameters
  • tests that the correct errors are thrown with invalid arguments exist
  • tests to ensure that the fp module functions return the correct results when invoked with valid arguments

Documentation

In your README.md, describe the exported values of each module you have defined. Every function description should include it's airty (expected number of parameters), the expected data for each parameter (data-type and limitations), and it's behavior (for both valid and invalid use). Feel free to add any additional information in your README.md that you would like.

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