如何按以字符串开头的元素(数组)筛选数组中对象的列表

Question

我有以下对象表：

var search = ["LFBB"];
var data = [
{ id: 1, date: "18-02-2016", valname: ["LFBBR1", "LFFFE5", "LFMBR1", "LFBB5"]  },
{ id: 2, date: "19-02-2016", valname: ["LFFF6", "EESF7", "LFMBR1", "LFGG3"]  },
{ id: 3, date: "14-02-2016", valname: ["LFBBL2", "LFFBC5", "LFMBR1", "LFBB5"]  },
{ id: 4, date: "17-02-2016", valname: ["LEEE5", "LFFFE8", "BGTT5", "LFHT9"]  },
];

var搜索="；LFBB"；

如果"0"的值为0；valname"；与"0"的值匹配；搜索"；

如果search＝"0"；LFBB"；过滤器应返回以下结果：

过滤后的结果：

data = [
{ id: 1, date: "18-02-2016", valname: ["LFBBR1", "LFFFE5", "LFMBR1", "LFBB5"]},
{ id: 3, date: "14-02-2016", valname: ["LFBBL2", "LFFBC5", "LFMBR1", "LFBB5"]}
],

我试着用

var startsWithN = data.((data) => data.startsWith(source));

但不起作用

感谢您的帮助

Answer 1

var search = "LFBB";
var data = [
{ id: 1, date: "18-02-2016", valname: ["LFBBR1", "LFFFE5", "LFMBR1", "LFBB5"]  },
{ id: 2, date: "19-02-2016", valname: ["LFFF6", "EESF7", "LFMBR1", "LFGG3"]  },
{ id: 3, date: "14-02-2016", valname: ["LFBBL2", "LFFBC5", "LFMBR1", "LFBB5"]  },
{ id: 4, date: "17-02-2016", valname: ["LEEE5", "LFFFE8", "BGTT5", "LFHT9"]  },
];
output=data.filter(x=>x.valname.findIndex(v=>v.startsWith(search))>-1);
console.log(JSON.stringify(output, null, 4));

输出将生成

[
{
"id": 1,
"date": "18-02-2016",
"valname": [
"LFBBR1",
"LFFFE5",
"LFMBR1",
"LFBB5"
]
},
{
"id": 3,
"date": "14-02-2016",
"valname": [
"LFBBL2",
"LFFBC5",
"LFMBR1",
"LFBB5"
]
}
]

Answer 2

您需要迭代valname并检查是否以所需字符串开头。

const
data = [{ id: 1, date: "18-02-2016", valname: ["LFBBR1", "LFFFE5", "LFMBR1", "LFBB5"]  }, { id: 2, date: "19-02-2016", valname: ["LFFF6", "EESF7", "LFMBR1", "LFGG3"]  }, { id: 3, date: "14-02-2016", valname: ["LFBBL2", "LFFBC5", "LFMBR1", "LFBB5"]  }, { id: 4, date: "17-02-2016", valname: ["LEEE5", "LFFFE8", "BGTT5", "LFHT9"]  }],
search = "LFBB",
result = data.filter(({ valname }) => valname.some(n => n.startsWith(search)));

console.log(result);

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通过拥有一个搜索值数组，您还需要迭代这个数组。

const
data = [{ id: 1, date: "18-02-2016", valname: ["LFBBR1", "LFFFE5", "LFMBR1", "LFBB5"]  }, { id: 2, date: "19-02-2016", valname: ["LFFF6", "EESF7", "LFMBR1", "LFGG3"]  }, { id: 3, date: "14-02-2016", valname: ["LFBBL2", "LFFBC5", "LFMBR1", "LFBB5"]  }, { id: 4, date: "17-02-2016", valname: ["LEEE5", "LFFFE8", "BGTT5", "LFHT9"]  }],
search = ["LFBB", "LEE"],
result = data.filter(({ valname }) =>
valname.some(n =>
search.some(s => n.startsWith(s))
)
);

console.log(result);

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