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    compute-midrange

    1.0.0 • Public • Published

    Mid-range

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    Computes the mid-range (mid-extreme) of a numeric array.

    The mid-range, or mid-extreme, is the arithmetic mean of the maximum and minimum values in a data set. It is the midpoint of the range and a measure of central tendency.

    Installation

    $ npm install compute-midrange

    For use in the browser, use browserify.

    Usage

    To use the module,

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

    midrange( arr[, sorted] )

    Computes the mid-range of a numeric array.

    var unsorted = [ 8, 2, 3, 9, 5, 1, 4, 100, 7, 0, 6 ];
     
    var midr = midrange( unsorted );
    // returns 50

    If the input array is already sorted in ascending order, set the optional second argument to true.

    var sorted = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 100 ];
     
    var midr = midrange( sorted, true );
    // returns 50

    Notes

    If the input array is empty, returns NaN.

    Examples

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

    License

    MIT license.


    Copyright

    Copyright © 2014. Rebekah Smith.

    Install

    npm i compute-midrange

    DownloadsWeekly Downloads

    368

    Version

    1.0.0

    License

    none

    Last publish

    Collaborators

    • kgryte
    • rebekahj