子数组是否包含某个值？

Question

I have an array like this:

var = [
    {
        "a": "value",
        "b": "value2"
    },
    {
        "a": "value3",
        "b": "value4"
    }
    ...
]

I need to find if any of the subarrays contain a certain value.

I tried

var.flat().includes("value")

but that always returned false for some reason and .flat() didn't even flatten the array.

I also tried

var.includes("value")

without the .flat() but that would only return if the top level includes it.

I could do

var = [
    "a": [
        "value",
        "value3"
        ...
    ],
    "b": [
        "value2",
        "value4"
        ...
    ]
]

but I'd rather not since that'd require me to rewrite some code I already wrote.

Answer 1

Use flatMap to extract all nested values into a single flat array first:

 const objs = [ { "a": "value", "b": "value2" }, { "a": "value3", "b": "value4" } ]; const values = objs.flatMap(Object.values); console.log(values.includes("value"));

Answer 2

You could iterate with some (it would stop the loop immediately when encounter the first value ), combine with Object.values (get array of values from an object) and .includes (to check if the array has value ),

 const data = [ { a: "value", b: "value2", }, { a: "value3", b: "value4", }, ]; const valid = data.some((d) => Object.values(d).includes("value")); console.log(valid);

Answer 3

In your code, varr is already flatten array of objects. Since you want to check in Object values. Use varr.map(Object.values).flat()

 varr = [ { a: "value", b: "value2", }, { a: "value3", b: "value4", }, ]; console.log(varr.map(Object.values).flat().includes("value"));