rows.js
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	const arrayify = require('array-back')
	const Cell = require('./cell')
	const t = require('typical')

	/**
	*
	*/
	class Rows {
	constructor (rows, columns) {
	this.list = []
	this.load(rows, columns)
	}

	load (rows, columns) {
	arrayify(rows).forEach(row => {
	this.list.push(new Map(objectToIterable(row, columns)))
	})
	}

	static removeEmptyColumns (data) {
	const distinctColumnNames = data.reduce((columnNames, row) => {
	Object.keys(row).forEach(key => {
	if (columnNames.indexOf(key) === -1) columnNames.push(key)
	})
	return columnNames
	}, [])

	const emptyColumns = distinctColumnNames.filter(columnName => {
	const hasValue = data.some(row => {
	const value = row[columnName]
	return (t.isDefined(value) && typeof value !== 'string') \|\| (typeof value === 'string' && /\S+/.test(value))
	})
	return !hasValue
	})

	return data.map(row => {
	emptyColumns.forEach(emptyCol => delete row[emptyCol])
	return row
	})
	}
	}

	function objectToIterable (row, columns) {
	return columns.list.map(column => {
	return [ column, new Cell(row[column.name], column) ]
	})
	}

	/**
	* @module rows
	*/
	module.exports = Rows