Array of object - get id for selected user name inside function

【问题标题】：Array of object - get id for selected user name inside functionArray of object - get id for selected user name inside function
【发布时间】：2022-11-20 20:32:08
【问题描述】：

const user = [
{name:"jonh" ,id:EAD1234},
{name:"peter" ,id:EAD1235},
{name:"matt" ,id:EAD1236},
{name:"henry" ,id:EAD1237},
]

I have above mentioned array of object, I want to get selected user id dynamically based on user selection using es6 and javascript e.g. if i select john i should get EAD1234. and it must suitable on large number of records

I tried using filter method

【问题讨论】：

Is filter() doesn't work for you?
i need to call it inside submit function where it might iterate over large number of data and it might affect performance
Then the better choice is to store the data inside a database or cache

标签： javascript reactjs arrays ecmascript-6

【解决方案1】：

If the data is samll,then just combine Array.filter() and Array.map() can do it.

If the data is too large,we can store the data into a database such as mysql or redis,then query it dynamiclly

const user = [
{name:"jonh" ,id:'EAD1234'},
{name:"peter" ,id:'EAD1235'},
{name:"matt" ,id:'EAD1236'},
{name:"henry" ,id:'EAD1237'}
]

let id = 'EAD1234'
let result = user.filter(u => u.id === id).map(u => u.name)
console.log(result)

【讨论】：

let id = 'EAD1234' should not be hard coded
let id = 'EAD1234' it will depends on your input