■ sum
サンプル
<html> <head> <style> </style> <meta charset="UTF-8"> <!-- Load d3.js --> <script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> </head> <body> <div id="result"></div> <script> var dataset = [ { yValue: 5 }, { yValue: 2 }, { yValue: 3 }, { yValue: 5 }, { yValue: 2 }, { yValue: 3 }, { yValue: 10 }, { yValue: 10 }, { yValue: 60 }, ]; var sum = d3.sum(dataset, function(d) { return d.yValue; }); d3.select("#result").text("Sum : " + sum); </script> </body> </html>
出力結果
Sum : 100
■ max
サンプル
* 配列内の絶対値で最大なもの<html> <head> <style> </style> <meta charset="UTF-8"> <!-- Load d3.js --> <script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> </head> <body> <div id="result"></div> <script> var dataset = [ { yValue: 23 }, { yValue: -31 }, { yValue: 45 }, { yValue: 80 }, { yValue: -120 }, { yValue: 109 }, { yValue: -98 }, { yValue: 0 }, { yValue: 65 }, ]; var max = d3.max(dataset, function(d) { return Math.abs(d.yValue); }); d3.select("#result").text("Max : " + max); </script> </body> </html>
出力結果
Max : 120
■ map / map.get() / map.has()
サンプル
<html> <head> <style> </style> <meta charset="UTF-8"> <!-- Load d3.js --> <script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> </head> <body> <div id="result1"></div> <div id="result2"></div> <div id="result3"></div> <script> var dataset = [ { id: "001", yValue: 23 }, { id: "002", yValue: -31 }, { id: "003", yValue: 45 }, { id: "004", yValue: 80 }, { id: "005", yValue: -120 }, { id: "006", yValue: 109 }, { id: "007", yValue: -98 }, { id: "008", yValue: 0 }, { id: "009", yValue: 65 }, ]; var datasetMapper = d3.map(dataset, function(d) { return d.id; }); var targetObject = datasetMapper.get("006"); d3.select("#result1").text("Result (get('006')) : " + targetObject.yValue); var isTrue = datasetMapper.has("005"); d3.select("#result2").text("Result (has('005')) : " + isTrue); var isFalse = datasetMapper.has("010"); d3.select("#result3").text("Result (has('010')) : " + isFalse); </script> </body> </html>
出力結果
Result (get('006')) : 109 Result (has('005')) : true Result (has('010')) : false
参考文献
http://y-uti.hatenablog.jp/entry/2014/04/05/111340http://qiita.com/nyasu1111/items/bef2d26800748a3661ec
サンプル
maxhttp://www.openspc2.org/reibun/D3.js/code/array/0002/index.html