I need help creating a Typescript function that takes 2 arguments, where the second argument is always a string type. This function should apply the second argument as a property on the first argument.
For example:
let x = measure('Hello', 'length'); // should return 'Hello'.length
// => x = 5
Any suggestions on how I can convert the string 'length' into a property of 'Hello' to achieve the desired result?
Upon grasping your concept:
function measure(obj: any, property: string): any {
return obj[property];
}
let x = measure('Hello', 'length');
console.log(x); // 5
An alternative approach could be:
function measure<T, K extends keyof T>(obj: T, property: K): T[K] {
return obj[property];
}
This version allows the compiler to deduce the returned value's type and ensures usage of only existing property names, as demonstrated below:
let x = measure('Hello', 'lengthy'); // triggers error
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