this question solution is already available in stackoverflow but, i am still confuse,i have use same as they answer still go this error please help me to get out of this error thank you my list of object is
const typeValue = [
{name: "Subscription", value: "subscription", rank: 2},
{name: "Single", value: "single", rank: 3},
{name: "Trial", value: "trial", rank: 0},
{name: "Unlimited", value: "unlimited", rank: 1000},
{name: "Promo", value: "promo", rank: 1},
{name: "Test", value: "test", rank: 0},
{name: "Brand", value: "brand", rank: 3}
]
any i want to find rank number
rank: typeValue.find(x => x.value === snapshot.data().type).rank
find will return undefined if it can't find a match, and then it is illegal to call .rank. To solve, use ?.rank instead:
rank: typeValue.find(x => x.value === snapshot.data().type)?.rank
If the problem persists, then you may have to do the same for .type:
rank: typeValue.find(x => x.value === snapshot.data()?.type)?.rank
typeValue.find(x => x.value === snapshot.data().type)
You're trying to find an element in typeValue that satisfies x.value === snapshot.data().type, but snapshot.data().type could be anything so TypeScript is warning that typeValue.find(x => x.value === snapshot.data().type) may return undefined.
If you want to tell TypeScript that x.value === snapshot.data().type will definitely match one of the elements, you can use !:
rank: typeValue.find(x => x.value === snapshot.data().type)!.rank
You can also use ? if rank can be undefined:
rank: typeValue.find(x => x.value === snapshot.data().type)?.rank
typeValue array variable :-const typeValue: { name: string; value: string; rank: number }[] = [
{ name: "Subscription", value: "subscription", rank: 2 },
{ name: "Single", value: "single", rank: 3 },
{ name: "Trial", value: "trial", rank: 0 },
{ name: "Unlimited", value: "unlimited", rank: 1000 },
{ name: "Promo", value: "promo", rank: 1 },
{ name: "Test", value: "test", rank: 0 },
{ name: "Brand", value: "brand", rank: 3 },
];
snapshot.data().type, if you didn't declared it already!