javascript - 过滤数组的数组以获取嵌套数组内的值

Question

我正在尝试解决这个问题，我有一个带有嵌套数组的数组，如下所示

var array = [
  [12, 43801309, "21.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [13, 43801308, "22.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [34, 43801307, "23.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [234, 43801308, "24.10.2018 00:00:00", 0.00089, 0.00055, 0.0004]
]

我想过滤这些嵌套数组的 [index = 1] 以获得某些值，例如 43801309如果它只是该数组中的单个值

array.filter(function(val) { 
    return val === lookupVal;
});

效果很好，但如果我尝试

array.filter(function(arr) {
    return arr.filter(function(val) {
        return val === lookupVal;
    });
});

它不起作用

Answer 1

如果[index]始终是数组的第二个元素，您可以简单地检查索引1处的值是否是所需的索引。

var array = [
  [12, 43801309, "21.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [13, 43801308, "22.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [34, 43801307, "23.10.2018 00:00:00", 0.00089, 0.00055, 0.0004],
  [234, 43801308, "24.10.2018 00:00:00", 0.00089, 0.00055, 0.0004]
];

var targetIndex = 43801308;

var filtered = array.filter(val => val[1] === targetIndex);

console.log(filtered);