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Object Diffing

Background

Ever wonder how tools like git parse your source code and determine what you've added and subtracted from the last commit?

Today we're going to build our own diffing tool to compare JavaScript objects full of fruit data!

Diffing an Object

Given JavaScript objects like this

newCode = {
  apples: 3,
  oranges: 4
}

oldCode = {
  apples: 3,
  grapes: 5
}

Create a function that returns an array containing the object diff like this

diff(newCode, oldCode)

// returns:
// [
//   ['-', 'grapes', 5],
//   ['+', 'oranges', 4]
// ]

Getting Started

The file you will be editing is object-diff.js.

The object-diff-test.js file includes a test suite to run your code against.

Run node object-diff-test.js to run the test suite in full. As you write code to pass tests, make sure you unskip succeeding tests by changing test.skip to just test.