如何通过其值将某些键查找到混合对象数组中？

Question

const items = [ { 'first': [205, 208, 222] }, { 'second': 205 } ]

I need to find keys by all coincidence into its value/values

example:

find key by id=205 , output: 'first', 'second'

find key by id=208 , output: 'first'

Answer 1

You can try getting the arrays of keys and values, then filter the keys and check if the corresponding index in values contain the variable id .

 const items = [ { 'first': [205, 208, 222] }, { 'second': 205 } ] const id = 205; let keys = items.map(item => Object.keys(item)[0]); let values = items.map(item => Object.values(item)[0]); let output = keys.filter((_, index) => (values[index] == id || (typeof(values[index]) == 'object' && values[index].includes(id)))); console.log(output)

Answer 2

You can click on 'Run code snippet' and see the output as mentioned in the question

 const items = [{ first: [205, 208, 222], }, { second: 205, }, ]; const toFind = 205; const fin = items.reduce((finalOutput, item) => { let key = Object.keys(item)[0]; if (Array.isArray(item[key])) { if (item[key].includes(toFind)) finalOutput.push(key); } else if (item[key] === toFind) { finalOutput.push(key); } return finalOutput; }, []); console.log(fin);

Answer 3

You can do something like this

 const items = [ { 'first': [205, 208, 222] }, { 'second': 205 } ] const findKey = (data, value) => data.reduce((res, item) => { let [[key, v]] = Object.entries(item) v = Array.isArray(v)?v: [v] if(v.includes(value)){ return [...res, key] } return res }, []) console.log(findKey(items, 205)) console.log(findKey(items, 208))

Answer 4

Format your items data properly, then:

const items = [ { 'first': [205, 208, 201] }, { 'second': [205] } ]

const findKeys = n => items.reduce((acc, obj) => 
    Object.values(obj).some(arr => arr.includes(n)) ? 
        acc.concat(Object.keys(obj)) : 
        acc, 
    [])

const res = findKeys(208)

// Output: ['first']
console.log(res)