diff
Computes the differences between adjacent elements in an array of values.
Installation
$ npm install compute-diff
For use in the browser, use browserify.
Usage
To use the module,
var diff = ;
diff( arr )
Computes the differences between adjacent array values.
var data = 1 3 2 10 5 ;var vals = ;// returns [ -2, 1, -8, 5 ]
Note: the returned array
will have a length which is one less than the original array
; i.e., if arr.length = 10
, then diff( arr ).length = 9
.
Examples
var diff = ;var data = 100 ;for var i = 0; i < datalength; i++data i = Math;console;
To run the example code from the top-level application directory,
$ node ./examples/index.js
Tests
Unit
Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
Test Coverage
This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
$ make test-cov
Istanbul creates a ./reports/coverage
directory. To access an HTML version of the report,
$ make view-cov
License
Copyright
Copyright © 2014. Athan Reines.