我正在嘗試檢查嵌套陣列中是否存在值。這就是我正在使用的資料的樣子：
[
{
name: 'bob',
occupation: ['Teacher', 'Store Owner'],
},
{
name: 'grace',
occupation: ['Doctor'],
},
]
我正在嘗試查看職業值是否已經存在。這是我當前的代碼：
const occupationExists = (value) => users.some((user) => user.occupation === value);
我知道這不起作用，因為它沒有訪問陣列中的值，但我該怎么做呢？任何幫助，將不勝感激。
uj5u.com熱心網友回復：
occupation您還需要檢查Array#includes.
const occupationExists = value => users.some(user =>
user.occupation.includes(value)
);
uj5u.com熱心網友回復：
這應該可以解決問題，它根據職業是否存在回傳真/假。
let users = [
{
name: 'bob',
occupation: ['Teacher', 'Store Owner'],
},
{
name: 'grace',
occupation: ['Doctor'],
},
]
const occupationExists = (value) => {
let res = users.filter((user) =>
user.occupation.indexOf(value) != -1
)
return res.length > 0
}
let value = 'Doctor'
console.log(occupationExists(value))
uj5u.com熱心網友回復：
這是一個問題user.occupation === value：user.occupation是一個字串陣列，value而是一個字串，因此您無法比較兩者。您可以Array#includes()按照@NinaScholz 的說明使用，也可以使用另一個（內部）Array#some()，在其中您可以將字串與字串進行比較：job === value。
const users = [{name: 'bob',occupation: ['Teacher', 'Store Owner']}, {name: 'grace',occupation: ['Doctor']}];
//const occupationExists = value => users.some(user => user.occupation.includes(value)); //best answer
//Alternative answer
const occupationExists = value => users.some(
user => user.occupation.some(job => job === value)
);
console.log( occupationExists('Teacher') );
console.log( occupationExists('Developer') );uj5u.com熱心網友回復：
let aoo = [
{
name: 'bob',
occupation: ['Teacher', 'Store Owner'],
},
{
name: 'grace',
occupation: ['Doctor', 'Store Owner'],
},
]
let fullOccupation = []
aoo.map(obj => {
obj.occupation.map(occ => {
const check = fullOccupation.includes(occ)
console.log(occ)
if(!check)
{
fullOccupation.push(occ)
}else{
alert(occ)
}
})
})轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/444935.html
標籤：javascript 数组 反应 数据结构
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