After creating a numericQuantity variable that is a casted string quantity, I was puzzled as to why the typeof returns string even though the variable is supposed to be of type :number.
let quantity: string = '10';
let numericQuantity: number = quantity as unknown as number;
console.log(typeof quantity); // string
console.log(typeof numericQuantity); //string
I decided to experiment on the typescript playground and encountered the same outcome.
Avoid using quantity as unknown as number, as this approach simply pacifies the typescript compiler without truly addressing any underlying issues. It is important to ensure that your code is correct and functional rather than just bypassing type restrictions.
Remember, typeof is not a typescript operator that defines the declared type. It is actually a javascript operator that specifies the type of the value during runtime. In this case, your numericQuantity variable stores a string value.
If your goal is to convert a string value into a numerical value, instead of blindly assigning numericQuantity = quantity with an assertion to the compiler, consider implementing it like this:
const quantity = '10';
const numericQuantity = Number(quantity);
console.log(typeof quantity); // string
console.log(typeof numericQuantity); // number
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