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33 lines
901 B
JavaScript
33 lines
901 B
JavaScript
/**
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* It can sometimes be useful to get the average of data in an API result set,
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* be it from a column, or a collection of cells. This method provides exactly
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* that ability.
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*
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* @name average()
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* @summary Average the values in a data set.
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* @author [Allan Jardine](http://sprymedia.co.uk)
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* @requires DataTables 1.10+
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*
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* @returns {Number} Calculated average
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*
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* @example
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* // Average a column
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* var table = $('#example').DataTable();
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* table.column( 3 ).data().average();
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*
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* @example
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* // Average two cells
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* var table = $('#example').DataTable();
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* table.cells( 0, [3,4] ).data().average();
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*/
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jQuery.fn.dataTable.Api.register( 'average()', function () {
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var data = this.flatten();
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var sum = data.reduce( function ( a, b ) {
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return (a*1) + (b*1); // cast values in-case they are strings
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} );
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return sum / data.length;
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} );
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