typescript union types
type Cow = {
name: string;
moo: () => void;
};
type Dog = {
name: string;
bark: () => void;
};
type Cat = {
name: string;
meow: () => void;
};
// union type
type Animals = Cow | Dog | Cat;typescript union types
type Cow = {
name: string;
moo: () => void;
};
type Dog = {
name: string;
bark: () => void;
};
type Cat = {
name: string;
meow: () => void;
};
// union type
type Animals = Cow | Dog | Cat;union value typescript
let myVar : string | number; //Variable with union type declaration
myVar = 100; //OK
myVar = 'Lokesh'; //OK
myVar = true; //Error - boolean not allowedunion value typescript
let myVar : string | number; //myVar can store string and number typesuse type as value typescript
Typescript interfaces aren''t being compiled into the js output, and you can not use them at runtimetypescript union
// Union Type: function reacts depending on x type (array of string OR string)
function welcomePeople(x: string[] | string) {
if (Array.isArray(x)) {
console.log("Hello, " + x.join(" and ")); // 'x' is 'string[]'
} else {
console.log("Welcome lone traveler " + x); // 'x' is 'string'
}
}Copyright © 2021 Codeinu
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