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@Alexei-B Alexei-B/FizzBuzz.ts
Last active Aug 7, 2017

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The game of FizzBuzz as written in TypeScript.
/**
* Represents the result of a round of FizzBuzz.
* @typedef {string | number} FizzBuzzResult
*/
type FizzBuzzResult = string | number;
/**
* Defines the function signature for a rule.
* @typedef {(n: number) => string} Rule
*/
type Rule = (n: number) => string;
/**
* A game of FizzBuzz.
*/
class FizzBuzz implements IterableIterator<FizzBuzzResult>
{
/**
* Creates a game of FizzBuzz.
* @param {Iterator<number>} sequence The sequence of numbers to play the game over.
* @param {Rule[]} rules The rules to use for the game.
*/
constructor(
private sequence: Iterator<number>,
private rules: Rule[]
) { }
/**
* Produces the next result in the game.
* @returns {IteratorResult<FizzBuzzResult>} The next value and done state of the game.
*/
public next(): IteratorResult<FizzBuzzResult> {
let seq = this.sequence.next();
if (seq.done) {
return { done: true, value: "" };
}
return { done: false, value: this.ApplyRules(seq.value) }
}
/**
* Provides the iterator interface for the game.
*/
public [Symbol.iterator](): IterableIterator<FizzBuzzResult> {
return this;
}
/**
* Applies the game rules to a given number.
* @param {number} n The number to apply the rules of the game to.
* @returns {FizzBuzzResult} The result for this number.
*/
public ApplyRules(n: number): FizzBuzzResult {
let result = this.rules
.map(r => r(n))
.reduce((p, c) => p + c);
return result.length == 0 ? n : result;
}
}
// Get a number sequence from 1 to 100 inclusive.
let sequence = (new Array(101)).keys();
sequence.next();
// Create a set of FizzBuzz game rules.
let fb = new FizzBuzz(sequence, [
i => i%3 == 0 ? "Fizz" : "",
i => i%5 == 0 ? "Buzz" : ""
]);
// Play the game of FizzBuzz.
let round: IteratorResult<FizzBuzzResult>;
while (round = fb.next(), !round.done) {
console.log(round.value);
}
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