I need help with a function that is defined like this:
const func = (array: {}[], object: {}) => {}
The keys of objects within the array should match the keys in the object.
Is there a way to accomplish this?
I need help with a function that is defined like this:
const func = (array: {}[], object: {}) => {}
The keys of objects within the array should match the keys in the object.
Is there a way to accomplish this?
Yes, it is possible to achieve this:
type Dictionary<V> = {[k: string]: V};
const func = <T>(array: (Record<keyof T, any> & Dictionary<any>)[], object: T) => {};
In the code snippet above, the function func is declared as a generic function that enforces a specific relationship between the types of array and object. More specifically, the type of array is constrained to be a Record<keyof T, any>, which is a mapped type having the same keys as T but can have any values. Additionally, the Dictionary<any> type with an index signature allows for extra keys in array without causing errors. Let's test the function:
func([{a: 1, b: true}], {a: "hey", b: "you"}); // succeeds
func([{a: 1}], {a: "hey", b: "you"}); // fails, missing property 'b' in '{ a: number; }'
func([{a: 1, b: true, c: "1"}], {a: "hey", b: "you"}); // also succeeds due to Dictionary type
The function works as expected. I hope this explanation clarifies things. Best of luck!
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