suVeneのあれ: [JavaScript]数値を3桁ごとに区切る
これ↑を見かけたので試してみました。
最初に結論を書いておくと、やっぱり
iandeth. - javascriptで数値をカンマ区切り文字列に変換する関数メモ
↑これ速いですね。
僕が考えたものも載せてありますが、速くしようと努力した訳じゃなくて、
こうやれば動くかなぁ、あ、動いた、よかったよかった、ってだけのものですので、
あしからず。
追記2
この計測の仕方よくないかも。ばらつきが大きいや。
なので今ここに載っている計測結果も信憑性は低いです。すみません。
追記
あ、gotin版-を考慮してないや。失格。
修正。
3桁ごとに区切る - Higé au lait
Number.prototype.split3_1 = function() { var r = ""; var s = this.toString().split("").reverse(); for(var i = 0; i < s.length; i++) { if(i % 3 == 0 && i != 0 && s[i] != "-") { r = s[i] + "," + r } else { r = s[i] + r; } } return r; }
iandeth. - javascriptで数値をカンマ区切り文字列に変換する関数メモ
Number.prototype.split3_2 = function () { var to = String(this); var tmp = ""; while (to != (tmp = to.replace(/^([+-]?\d+)(\d\d\d)/,"$1,$2"))){ to = tmp; } return to; }
JavaScriptで数値を3桁ごとに区切る - 0xFF
Number.prototype.split3_3 = function() { var m = (this < 0) ? -1 : 1; var str = String(this*m).split('.'); var arr = String(str[0]).split(''), len = Math.ceil(arr.length/3), res = []; for (var i =0;i<len;++i) res.push(arr.splice(-3,3).join('')); return (m == -1 ? '-' : '') + res.reverse().join(',') + (str[1] ? '.' + str[1] : ''); };
suVeneのあれ: [JavaScript]数値を3桁ごとに区切る
Number.prototype.split3_4 = function() { ('' + this).match(/(-?)([0-9]+)(\.[0-9]*)?/); var sp = [RegExp.$1, RegExp.$2, RegExp.$3]; var x = Math.floor(sp[1].length / 3) * 3; var len = sp[1].length; return sp[0] + (sp[1].substr(0, len - x)) + (len - x == 0 ? '' : ',') + (sp[1].substr(len - x, x).match(/[0-9]{3}/g).join(',')) + sp[2]; }
Sbox Error
Number.prototype.split3_5 = function() { var r = '', s = this.toString(); s.match(/(-?)([0-9]+)(\.[0-9]*)?/); var sp = [RegExp.$1, s = parseInt(RegExp.$2), RegExp.$3]; while(s >= 1000) { r = ',' + (s%1000) + r; s = parseInt(s/1000); } return sp[0] + s + r + sp[2]; }
2007-12-07 - ellaneous
Number.prototype.split3_6 = function(interval){ var i = interval | 0 || 3; return (this + (this == parseInt(this) ? '.' : '#')).replace( RegExp('(\\d+?)(?=(?:\\d{'+i+'})+\\.)|(\\d{'+i+'})(?=\\d+#)', 'g'), '$1$2,').slice(0, -1); };
数値をカンマ区切りにする: Days on the Moon
Number.prototype.split3_7 = function () { var string = "" + +this; var pointIndex = string.indexOf("."); return (pointIndex == -1) ? string.replace(/(\d{1,3})(?=(?:\d\d\d)+$)/g, "$1,") : string.substring(0, pointIndex) .replace(/(\d{1,3})(?=(?:\d\d\d)+$)/g, "$1,") + string.substring(pointIndex) .replace(/(\d\d\d)(?=\d)/g, "$1,"); };
gotin版（中身はほとんど変えず、ちょっとだけ短くした）
Number.prototype.split3_g = function(){ (""+this).match(/([-+]?)(\d*)(\.\d*)?/); for(var buf=[],tmp=Math.floor(parseInt(RegExp.$2));tmp > 0;tmp = Math.floor(tmp/ 1000)){ buf.unshift(tmp%1000); } return RegExp.$1 + buf.join(",") + RegExp.$3; };
実験
// print definition. // use console.log() when "this" has Firebug. // Usually I use spidermonkey for tests like this script. if("console" in this){ function print(m){ console.log(m); } } // test number var x = 123456789; var x2 = -123456789.123456789876; // timer(1000times test) function time(f){ var s = new Date().getTime(); for(var i=0;i<1000;i++) f.apply(x); return new Date().getTime()-s; } Array.prototype.each = function(f){ for(var i=0,l=this.length;i<l;i++){ f(this[i], i); } }; // experiments with(Number.prototype){ var splits = "split3_1 split3_2 split3_3 split3_4 split3_5 split3_6 split3_7 split3_g".split(" "); print("// result:" + x); splits.each(function(f,i){print(splits[i]+":"+eval(f).call(x))}); print(""); print("// result:" + x2); splits.each(function(f,i){print(splits[i]+":"+eval(f).call(x2))}); print(""); print("// time:" + x); splits.each(function(f,i){print(splits[i]+":"+time(function(){eval(f).call(x)}))}); print(""); print("// time:" + x2); splits.each(function(f,i){print(splits[i]+":"+time(function(){eval(f).call(x2)}))}); print(""); }
結果
// result:123456789 split3_1:123,456,789 split3_2:123,456,789 split3_3:123,456,789 split3_4:123,456,789 split3_5:123,456,789 split3_6:123,456,789 split3_7:123,456,789 split3_g:123,456,789 // result:-123456789.12345679 split3_1:-123,456,789,.12,345,679 //? split3_2:-123,456,789.12345679 split3_3:-123,456,789.12345679 split3_4:-123,456,789.12345679 split3_5:-123,456,789.12345679 split3_6:-123,456,789.123,456,79 //? split3_7:-123,456,789.123,456,79 //? split3_g:-123,456,789.12345679 // time:123456789 split3_1:53 split3_2:41 split3_3:84 split3_4:60 split3_5:48 split3_6:54 split3_7:37 // fastest! split3_g:61 // time:-123456789.12345679 split3_1:74 split3_2:45 // fastest! split3_3:90 split3_4:66 split3_5:52 split3_6:76 split3_7:52 split3_g:56 */
