node.js 对浮点数数组进行排序
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Sorting array of float point numbers
提问by jviotti
I have an array of float point numbers:
我有一个浮点数数组：
[ 82.11742562118049, 28.86823689842918, 49.61295450928224, 5.861613903793295 ]
After running sort() on the array I get this:
在数组上运行 sort() 后，我得到了这个：
[ 28.86823689842918, 49.61295450928224, 5.861613903793295, 82.11742562118049 ]
Notice how 5.8... is bigger than 49.6... for JavaScript (Node). Why is that?
注意 JavaScript (Node) 的 5.8... 比 49.6... 大。这是为什么？
How can I correctly sort this numbers?
如何正确排序这些数字？
回答by dc5
Pass in a sort function:
传入一个排序函数：
[….].sort(function(a,b) { return a - b;});
results:
结果：
[5.861613903793295, 28.86823689842918, 49.61295450928224, 82.11742562118049]
If compareFunction is not supplied, elements are sorted by converting them to strings and comparing strings in lexicographic ("dictionary" or "telephone book," not numerical) order.
如果未提供 compareFunction，则通过将元素转换为字符串并按字典顺序（“字典”或“电话簿”，而不是数字）比较字符串来对元素进行排序。
回答by Matt Pavelle
The built in JS sort function treats everything as strings. Try making your own:
内置的 JS 排序函数将所有内容都视为字符串。尝试制作自己的：
var numbers = new Array ( 82.11742562118049, 28.86823689842918, 49.61295450928224, 5.861613903793295 );
function sortFloat(a,b) { return a - b; }
numbers.sort(sortFloat);
