Created
June 29, 2017 20:42
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Example of using keyof in typescript
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function filter<T, K extends keyof T>(obj : T, keys : [K], value: any) : boolean { | |
return keys.some(key => obj[key] === value); | |
} | |
let person = { | |
name: "bos", | |
firstName: "jos" | |
} | |
filter(person, ['firstName', "namee"], "jos"); | |
/* | |
ERROR: Argument of type '["firstName", "namee"]' is not assignable to parameter of type '["firstName" | "name"]'. | |
*/ |
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Instead of
value: any
you could also useT[K]
: