typescript type or null
let stringOrNullValue: string | null = null;
//it an take null as well as other type.
stringOrNullValue = "someString";typescript type or null
let stringOrNullValue: string | null = null;
//it an take null as well as other type.
stringOrNullValue = "someString";typescript declaring null
interface Employee1 {
name: string;
salary: number;
}
var a: Employee1 = { name: 'Bob', salary: 40000 }; // OK
var b: Employee1 = { name: 'Bob' }; // Not OK, you must have 'salary'
var c: Employee1 = { name: 'Bob', salary: undefined }; // OK
var d: Employee1 = { name: null, salary: undefined }; // OK
// OK
class SomeEmployeeA implements Employee1 {
public name = 'Bob';
public salary = 40000;
}
// Not OK: Must have 'salary'
class SomeEmployeeB implements Employee1 {
public name: string;
}Copyright © 2021 Codeinu
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