Question

我有一个包含节点和边缘内部边缘的数组，每个数组都有源，目标，数组人员，我想创建一个长度为数组的数组。

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数组如何显示：

  var officersScale = d3.scale.linear()
                                        .domain([1,  d3.max(dataset.edges.officers.length, function(d) { return d[0]; })])
                                        .range([1,10]);

Answer 1

首先，您的数据无效。存在无效的令牌，某些内部对象缺少{等。

但是，您可以遍历所有人员阵列，然后找到最大长度。我希望你知道如何创建规模，这对你来说。

var edges = [{"source":0,"target":29,"officers":["MEDORI, Rene"]},
           {"source":6,"target":28,"officers":["GILLIES, Crawford Scott","GRIMSTONE, Gerald Edgar, Sir"]},
           {"source":9,"target":10,"officers":["ANDERSON, Paul Milton"]},
           {"source":9,"target":19,"officers":["FREW, Anita Margaret"]},
           {"source":9,"target":23,"officers":["BRINDED, Malcolm Arthur"]},
           {"source":15,"target":32,"officers":["KENNEDY, Christopher John"]},
           {"source":24,"target":31,"officers":["CHAMBERS, Stuart John"]},
           {"source":28,"target":29,"officers":["GILLIES, Crawford Scott"]},
           "source":30,"target":31,"officers":["GROTE, Byron Elmer"]}];

使用d3.max

var maxlength = d3.max(edges, function(d) { return d.officers.length; })

使用简单的Array.prototype.map和Math.max

var lengths = edges.map(function(edge){
     return edge.officers.length;
});

console.log(lengths);
var maxLength = Math.max(...lengths);

console.log(maxLength);

一步到位ES6

maxLength = Math.max(...edges.map(edge=> edge.officers.length));

查找嵌套数组的最大长度

1 个答案: