TypeScript: Unterschied zwischen den Versionen
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(Die Seite wurde neu angelegt: „= Links = * Angular = Konstanten, Variablen = * 'var'-Variablen sind global, 'let'-Variablen sind lokal (blockgebunden). <source lang="ts"> const E_DISK:…“) |
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const onlyNumbers: number[] = [ 1, 2, 3]; | const onlyNumbers: number[] = [ 1, 2, 3]; | ||
let arg: any = 5; ... arg = 'string'; | let arg: any = 5; ... arg = 'string'; | ||
let width, height: number; | |||
let rest: number[]; | |||
const [width, height] = [1, 2]; | |||
const [width, ...rest] = [1, 2, 3, 4]; // rest hat den Wert [2, 3, 4] | |||
</source> | </source> | ||
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== Any == | == Any == | ||
= Klassen = | |||
* Nur ein Konstruktor | * Nur ein Konstruktor | ||
<source lang="ts"> | <source lang="ts"> | ||
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set number(value: number): void { this.privateNumber = value; } | set number(value: number): void { this.privateNumber = value; } | ||
add(inc: number) => return privateNumber + number; | add(inc: number) => return privateNumber + number; | ||
printAll(...args): void { | |||
print(args[0] + ': ' + args); | |||
} | |||
} | } | ||
class SuperUser extends User { | class SuperUser extends User { | ||
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lastname = 'Smith'; | lastname = 'Smith'; | ||
} | } | ||
</source> | |||
= Operatoren = | |||
== spread-Operator == | |||
<source lang="ts"> | |||
let list1: number[] = [1, 2, 3]; | |||
let list2: number[] = [...list, 4, 5, ..list]; | |||
myFunc(1, 2, 3); | |||
myFunc(...list1); | |||
</source> | </source> |
Version vom 14. August 2021, 14:19 Uhr
Links
Konstanten, Variablen
- 'var'-Variablen sind global, 'let'-Variablen sind lokal (blockgebunden).
const E_DISK: string = 'disk error';
var globalLastMessage: string = 'Error';
for (let i=0; i < 4; i++){}
const myArray = [ 0, 'string', { firstname: 'Joe' } ];
const onlyNumbers: number[] = [ 1, 2, 3];
let arg: any = 5; ... arg = 'string';
let width, height: number;
let rest: number[];
const [width, height] = [1, 2];
const [width, ...rest] = [1, 2, 3, 4]; // rest hat den Wert [2, 3, 4]
Typen
String
let x ='Hi';
x = `2 lines:
Say: ${x}
`;
Number
Any
Klassen
- Nur ein Konstruktor
class User {
publicItems: string;
private privateMember: string = 'secret';
private privateNumber = 25; // impliziter Typ.
constructor(items: string){
this.privateItems = items;
}
append(item: string): string { this.publicItems += ';' + item; return this.publicItems; }
// getter + setter:
get currentNumber(): number { return this.privateNumber; }
set number(value: number): void { this.privateNumber = value; }
add(inc: number) => return privateNumber + number;
printAll(...args): void {
print(args[0] + ': ' + args);
}
}
class SuperUser extends User {
constructor(items: string){
super(items);
}
}
Interfaces
interface Contact {
firstname: string;
lastname: string;
}
const contact: Contact = {
firstname: 'Joe',
lastname: 'Doo'
}
class Address implements Contact {
firstname = 'Eve';
lastname = 'Smith';
}
Operatoren
spread-Operator
let list1: number[] = [1, 2, 3];
let list2: number[] = [...list, 4, 5, ..list];
myFunc(1, 2, 3);
myFunc(...list1);