lodown-brendang
v1.0.0
Published
This is my incredible amazing lodown library. Just kidding, it's terrible. But it shall be good. We shall never surrender. We shall fight in the oceans, we shall fight in the streets.
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lodown
An npm functional programming library project
Fork this repository to your own GitHub account.
Clone your forked version of the lodown repository to a new Cloud9 workspace or locally if you prefer.
To create a
package.json
configuration file for our lodown library, from the command-line, run the command:npm init
IMPORTANT CONFIGURATION: Fill in the prompts with your own details:
When asked for test command, enter:
istanbul cover _mocha -- test/ -R spec
When asked for your git repository, you will probably be given the correct url as the default, so just select this by pressing
return
, otherwise, provide your forked GitHub repository's url.
Install the required test libraries by running the following command:
npm install i -D mocha chai sinon istanbul
Write your tests in the file
test/index.spec.js
. Check out the chai api for and be careful when asserting/expecting against complex types - you'll have to make use of the.eql
api, and not.equal
. For example:expect(lodown.filter([1, 2, 3], function(value) { return value > 2; } )).to.eql([3]);
Implement your library in the file
index.js
. Remember thatindex.js
is a Node.js module, so you must export your API using, for example:module.exports.each = each;
To run your tests, run the following command:
npm test
Check the console output for passes and failures.
Preview (Cloud9) or open the file at
coverage/lcov-report/index.html
for your coverage report. Make certain all lines of code are traversed in your tests!
Solve
Using the file at test/fixtures/customers.json
, and utilizing your lodown library, write functions that take the Array of customers and return the following:
- how many males, how many females
- oldest customer, youngest customer
- average balance
- how many customer's names begin with some letter
- how many customer's friend's names begin with some letter
- how many customers are friends
- how many customers have friends in common
- most common tags
Resources:
Docs
- https://mochajs.org
- http://chaijs.com/api/bdd/
- http://sinonjs.org/docs/#spies-api
Reading
- http://marcofranssen.nl/using-mocha-chai-sinon-to-test-node-js/
- http://stackoverflow.com/questions/19298118/what-is-the-role-of-describe-in-mocha
- http://www.vapidspace.com/coding/2014/10/29/code-coverage-metrics-with-mocha-and-istanbul/
Quick Videos
- https://egghead.io/lessons/javascript-how-to-write-a-javascript-library-setting-up-unit-testing-with-mocha-and-chai
- https://egghead.io/lessons/javascript-how-to-write-a-javascript-library-unit-testing-with-mocha-and-chai