d3.group檔案說：
d3.group(iterable, ...keys)
例如，如果我有以下內容：
data = [
{name: "jim", amount: "34.0", date: "11/12/2015"},
{name: "carl", amount: "120.11", date: "11/12/2015"},
{name: "stacy", amount: "12.01", date: "01/04/2016"},
{name: "stacy", amount: "34.05", date: "01/04/2016"}
]
但不是：
d3.group(data, d => d.name, d => d.date)
我想做類似的事情：
d3.group(data, ['name', 'date'])
我該怎么做？原因是我可能事先不知道密鑰，并且必須以編程方式進行分組。
uj5u.com熱心網友回復：
...keys可以是 a map，它本身回傳一個函式，例如...keys.map(k => d => d[k]).
見下文 - 這使用groups而不是group在控制臺輸出中可讀 - 但這group也適用。
const data = [
{name: "jim", amount: "34.0", date: "11/12/2015"},
{name: "carl", amount: "120.11", date: "11/12/2015"},
{name: "stacy", amount: "12.01", date: "01/04/2016"},
{name: "stacy", amount: "34.05", date: "01/04/2016"}
];
const keys = ["name", "date"];
const grps = d3.groups(
data,
...keys.map(k => d => d[k])
);
console.log(grps);<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.6.1/d3.min.js"></script>轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/513938.html
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