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k keyof T

Ahmad Khalil answered on May 15, 2022 Popularity 4/10 Helpfulness 1/10

answer k keyof T

k keyof T

Comment

function prop<T, K extends keyof T>(obj: T, key: K) {
    return obj[key];
}
function prop2<T>(obj: T, key: keyof T) {
    return obj[key];
}

let o = {
    p1: 0,
    p2: ''
}

let v = prop(o, 'p1') // is number, K is of type 'p1'
let v2 = prop2(o, 'p1') // is number | string, no extra info is captured

Popularity 4/10 Helpfulness 1/10 Language whatever

Source: stackoverflow.com

Tags: k keyof whatever

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