Range

Computes the arithmetic range of an array.

Installation

$ npm install compute-range

For use in the browser, use browserify.

Usage

var range = require( 'compute-range' );

range( arr[, accessor] )

Computes the arithmetic range of an array. For primitive number arrays,

var arr = [ 2, 3, 4, 1 ];

var r = range( arr );
// returns [ 1, 4 ]

For object arrays, provide an accessor function for accessing numeric array values

var arr = [
	[1,2],
	[3,3],
	[4,4],
	[6,1]
];

function getValue( d ) {
	return d[ 1 ];
}

var r = range( arr, getValue );
// returns [ 1, 4 ]

Notes

• if provided an empty array, the function returns null.
• the first value of the returned array is always the minimum value and the second value is always the maximum value.

Examples

var range = require( 'compute-range' );

var data = new Array( 100 );
for ( var i = 0; i < data.length; i++ ) {
	data[ i ] = Math.random() * 100;
}
console.log( range( data ) );

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

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License

MIT license.

Copyright

Copyright © 2014-2015. Athan Reines.