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HTML

              
                <table>
  <thead>
    <tr>
      <th>Country</th>
      <th>Population (M)</th>
      <th>GNP (B)</th>
    </tr>
  </thead>
  <tbody>
    <tr><td>Belgium</td><td>11.162</td><td>419</td></tr>
    <tr><td>France</td><td>63.820</td><td>2246</td></tr>
    <tr><td>Germany</td><td>80.640</td><td>3139</td></tr>
    <tr><td>Greece</td><td>10.758</td><td>298</td></tr>
    <tr><td>Italy</td><td>59.789</td><td>1871</td></tr>
    <tr><td>Netherlands</td><td>16.795</td><td>713</td></tr>
    <tr><td>Poland</td><td>38.548</td><td>782</td></tr>
    <tr><td>Portugal</td><td>10.609</td><td>252</td></tr>
    <tr><td>United Kingdom</td><td>64.231</td><td>2290</td></tr>
    <tr><td>Spain</td><td>46.958</td><td>1432</td></tr>
  </tbody>
</table>
              
            
!

CSS

              
                
              
            
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JS

              
                /*
 *Functional JavaScript for crawling the Web
 *https://nicolas.perriault.net/code/2013/functional-javascript-for-crawling-the-web/
 *
 */



/*************************************************** *
 * Helper Fantion
 *************************************************/

//デバッグ用	
function logs(){
	console.log(arguments);
	return arguments;
}

	
//domから要素を取得
function nodes(sel, root){
	return (root || document).querySelectorAll(sel);
}

//nodesの中から特定の要素を見つけ出す
function finder(selector) {
  return function(root) {
    return nodes(selector, root);
  }
}

//与えられた関数を配列のすべての要素に対して適用
function map(fn, iterable){
	return [].map.call(iterable, fn)
}

//オブジェクトからプロパティを指定して取得
function prop(name){
	return function(object){
		return object[name];
	}
}

//functionを順番に実行
function sequence() {
	var fns = Array.prototype.slice.call(arguments);
	return fns.reduce(function(comp, fn) {
		return function(){
			var args =  Array.prototype.slice.call(arguments);
			return comp(fn.apply(null, args))
		};
	});
};


//隣り合う 2 つの配列要素に対して(左から右へ)同時に関数を適用
function reduce(fn, init, iterable){
	return [].reduce.call(iterable, fn, init)
}

//関数合成
function compose(){
	var fns = Array.prototype.slice.call(arguments);
	return sequence.apply(null, fns.reverse());
}

//カリー化
function curry( orig_func ) {
	var ap = Array.prototype;
	var args = arguments;
	
	function fn() {
		ap.push.apply( fn.args, arguments );
	
		return fn.args.length < orig_func.length
		  ? fn
		  : orig_func.apply( this, fn.args );
	};
	
	return function() {
		fn.args = ap.slice.call( args, 1 );
		return fn.apply( this, arguments );
	};
};

//部分適用
function partial( orig_func ) {
	var aps = Array.prototype.slice,
	args = aps.call( arguments, 1 );
	
	return function() {
		return orig_func.apply( this, args.concat( aps.call( arguments ) ) );
	};
};


/**************************************************
 *
 * 以下、main
 *
 *************************************************/

//テーブルからrow要素を取得
var  rows = nodes("tbody tr");
//rowsからtdを取得
var findCells = finder("td");
//セルのテキストを取得
var getText = prop("textContent");

var getFirst = prop(0);
var getSecond = prop(1);
var getThird = prop(2);

/*******************************
 * テーブルの1行目(国名)を取得
 *******************************/
console.log( "first-ColumnList", map(compose(findCells, getFirst, getText), rows) )

/*******************************
 * 途中の処理にlogsを挟んでデバッグ
 *******************************/
console.log( "debug", map(compose(findCells, getFirst, logs, getText), rows) )


/*******************************
 * 人口の合計を取得
 *******************************/
var sum = function(a, b) {
	return a + b;
}
var populations  =  map(compose(findCells, getSecond, getText, parseFloat), rows);
console.log("sum-populations", reduce(sum, 0, populations));



/*******************************
 * データをオブジェクトに変換
 *******************************/
var asObject = function(data){
	return {
		name:getFirst(data),
		population: parseFloat(getSecond(data)),
		gnp:parseFloat(getThird(data))
	}
};
var getTexts = partial(map, getText); //getText関数をmap関数に部分適用して、arrayにgetTextを使えるようにする
console.log("toObject",  map(compose(findCells, getTexts, asObject), rows ))




              
            
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