51. Create Generic Function with Keyof Constraint in the TypeScript.

Hi Friends
In this video, we will see how to use keyof constraint in the typescript language.

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[bobbysadhwani]

Great explanation sir. I have a doubt that why we used extend... Why we cannot do U keyof T ? and T: object

[balasubramani]

Hello @leela, Thanks for the video
"extractKeyFormObject" in this function what could be a return type, i tried with string, its throwing error.
can you please tell :)
function extractKeyFormObject<T extends object, B extends keyof T>(obj : T, key : B):string{
return obj[key];
}
extractKeyFormObject({name:"bala", age:20}, "name");