namespace Validation {
export interface StringValidator {
isAcceptable(s: string): boolean;
}
const lettersRegexp = /^[A-Za-z]+$/;
const numberRegexp = /^[0-9]+$/;
export class LettersOnlyValidator implements StringValidator {
isAcceptable(s: string) {
return lettersRegexp.test(s);
}
}
export class ZipCodeValidator implements StringValidator {
isAcceptable(s: string) {
return s.length === 5 && numberRegexp.test(s);
}
}
}
// Some samples to try
let strings = ["Hello", "98052", "101"];
// Validators to use
let validators: { [s: string]: Validation.StringValidator; } = {};
validators["ZIP code"] = new Validation.ZipCodeValidator();
validators["Letters only"] = new Validation.LettersOnlyValidator();
// Show whether each string passed each validator
for (let s of strings) {
for (let name in validators) {
console.log(`"${ s }" - ${ validators[name].isAcceptable(s) ? "matches" : "does not match" } ${ name }`);
}
}
下面这句乍一看有点糊涂,啥意思!
let validators: { [s: string]: Validation.StringValidator; } = {};
分析一下,
定义一个validators的对象,类型是一个字面量的对象,对象的键值是字符串类型 [s:string],对应的值是Validation.StringValidator,命名空间下的接口对象。
相当于
let 对象名:{[对象键值及类型]:对应的值}=空对象。