Lightweight table creator

createTable.js

/*! 
* Easy to use table creator
* afonsomatos <[email protected]>
*
* @param {Array} - Array containing the rows of the table
* @param {Object} [{rows: Array.length, 
*                   padding: 2, 
*                   marginLeft: 2, 
*                   lineHeight: 0, 
*                   cols: <row in most length>.length }] - Configure object
*
*/

let createTable  = function(arr, obj) {
	obj = obj || {};

	let rows       = obj.rows,
		cols 	   = obj.cols,
		padding    = obj.padding,
		lineBreaks = obj.lineBreaks,
		marginLeft = obj.marginLeft,
		lineHeight = obj.lineHeight;

	if (rows === undefined) {
		// Find number of rows by size
		rows = arr.length;
	}
	
	if (padding === undefined) {
		// Space between columns
		padding = 2;
	}

	if (marginLeft === undefined) {
		// Default margin left
		marginLeft = 2;	
	}

	if (lineHeight === undefined) {
		// Lines between rows
		lineHeight = 0;
	}
	
	if (cols === undefined) {
		// Find row with most elements
		cols = arr.reduce(function(len, val) {
			return Math.max(len, val.length);
		}, 0);
	}
	
	// Shrink desired rows
	arr = arr.slice(0, rows);
	
	return arr.map(function(row, r) {	

		return row.map(function(col, c) {
			// Handle undefined values
			col = col || "";
			
			// Shrink desired cols
			if (c > cols - 1) return "";
			
			// Find the element with greatest length in column
			let maxLen = arr.reduce(function(max, el) {
				return Math.max(max, (el[c] || "").length);
			}, 0)

			return " ".repeat(marginLeft) + col + " ".repeat(maxLen - col.length + padding);

		}).join('');

	}).join('\n'.repeat(lineHeight + 1));
};

let myTable = createTable([
	["-q", "--quit", "Quit program"],
	["-h", "--help", "Help for more information"],
	["-d", "--dance", "Make the command line dance"],
	["-p", "--panda", "Log panda"]
], {rows: 3, cols: 2, padding: 2, marginLeft: 2, lineHeight: 0});