| 1 | import { bench, group, run } from 'tatami-ng' |
| 2 | |
| 3 | const number = 30 |
| 4 | |
| 5 | /** |
| 6 | * @param num |
| 7 | * @returns |
| 8 | */ |
| 9 | function fibonacciLoop (num) { |
| 10 | const fib = [] |
| 11 | fib[0] = 0 |
| 12 | fib[1] = 1 |
| 13 | for (let i = 2; i <= num; i++) { |
| 14 | fib[i] = fib[i - 2] + fib[i - 1] |
| 15 | } |
| 16 | return fib[num] |
| 17 | } |
| 18 | |
| 19 | /** |
| 20 | * |
| 21 | * @param num |
| 22 | * @returns |
| 23 | */ |
| 24 | function fibonacciLoopWhile (num) { |
| 25 | let current = 1 |
| 26 | let previous = 0 |
| 27 | while (--num) { |
| 28 | const tmp = current |
| 29 | current += previous |
| 30 | previous = tmp |
| 31 | } |
| 32 | return current |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * @param num |
| 37 | * @returns |
| 38 | */ |
| 39 | function fibonacciRecursion (num) { |
| 40 | if (num <= 1) return num |
| 41 | return fibonacciRecursion(num - 1) + fibonacciRecursion(num - 2) |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * @param num |
| 46 | * @param memo |
| 47 | * @returns |
| 48 | */ |
| 49 | function fibonacciRecursionMemoization (num, memo) { |
| 50 | memo = memo || {} |
| 51 | |
| 52 | if (memo[num]) return memo[num] |
| 53 | if (num <= 1) return num |
| 54 | |
| 55 | return (memo[num] = |
| 56 | fibonacciRecursionMemoization(num - 1, memo) + |
| 57 | fibonacciRecursionMemoization(num - 2, memo)) |
| 58 | } |
| 59 | |
| 60 | group(`Fibonacci number ${number}`, () => { |
| 61 | bench('fibonacciLoop', () => { |
| 62 | fibonacciLoop(number) |
| 63 | }) |
| 64 | bench('fibonacciLoopWhile', () => { |
| 65 | fibonacciLoopWhile(number) |
| 66 | }) |
| 67 | bench('fibonacciRecursion', () => { |
| 68 | fibonacciRecursion(number) |
| 69 | }) |
| 70 | bench('fibonacciRecursionMemoization', () => { |
| 71 | fibonacciRecursionMemoization(number) |
| 72 | }) |
| 73 | }) |
| 74 | |
| 75 | await run({ |
| 76 | units: true, |
| 77 | }) |