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enum AllTheWays {
you = 1,
can = "can",
enum = 2,
really,
for,
namespace,
let,
of,
const,
var,
while,
true = 8,
}
enum LogLevel {
ERROR,
WARN,
INFO,
DEBUG,
}
/**
* This is equivalent to:
* type LogLevelStrings = 'ERROR' | 'WARN' | 'INFO' | 'DEBUG';
*/
type LogLevelStrings = keyof typeof LogLevel;
function printImportant(key: LogLevelStrings, message: string) {
const num = LogLevel[key];
if (num <= LogLevel.WARN) {
console.log("Log level key is:", key);
console.log("Log level value is:", num);
console.log("Log level message is:", message);
}
}
printImportant("WARN", "This is a message");
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}`,
);
}
}
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