Seeking to retrieve the id based on the animal's name:
enum Animals {
Cat = 1,
Dog, // 2
}
const name: string = "Cat";
const id: number = Animals[name] // Element implicitly has an 'any' type because index expression is not of type 'number'.
Cited from https://basarat.gitbooks.io/typescript/docs/enums.html#enums-and-strings
enum Tristate {
False,
True,
Unknown
}
console.log(Tristate["False"]); // 0
Issue - How can I obtain 1 linked with Cat
When utilizing a variable (for instance, category) to reference the value for an enumeration, if you specify the type as text, it assumes it could potentially contain any value, even ones that don't exist in the enum. Consequently, the result will display as whatever.
To circumvent this problem, you have the option of either directly invoking the enum (Cars['SUV']) or constraining the values of your variable to match the enum's values like so:
const category: 'Red' | 'Blue' = 'Red';
const quantity: number = Cars[category]; // 3
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