typescript declare variable undefined
let age: number | undefined;
age = 18;
if (age) {
// This will run because age is not null or undefined
}
age = undefined;
if (age) {
// This will not run because age is undefined
}
// If you want to do something when it is undefined
if (age === undefined) {
// This will run because age is undefined
}string undefined typescript
let name1:string = person.name!;
// ^ note the exclamation mark hereCopyright © 2021 Codeinu
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