HobbiesRepo

HOBBIES REPO

WELCOME TO MY HOBBIES REPO

UNUSEFUL codes are stored in this repository. https://heishi1humanity.github.io/HobbiesRepo/

WAVES

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• sine wave
• wave(Only html & CSS)
• wave
  wave are inspired by Adobe XD - Water animation in 6 minutes.

  sample images

  

PRIME NUMBER

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• Trial Division
  This code check the whether an argument is prime or not.
• Sieve Of Eratosthenes
  This code find the prime number between 2 and argument.
• Sieve Of Sundaram
  This code find the prime number between 2 and (2argument + 2).

MATH

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• GCD
  This function is based on Euclidean Algorithm.
• Convert Dec to Bin
  This function return 8 digit binary number from decimal.
• Determinant
  This function solve the determinant and return the answer.
• Newton’s Method
  This function return √(argument).
  tips: Newton’s method can find x which f(x) = 0.
• Statistics
  This file are written some basic statistics function.(mean/deviation/variance/stdev)

PI

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• Gauss Legendre Algorithm
  • initial value
    a₀ = 1
    b₀ = 1 / √2
    t₀ = 1 / 4
    p₀ = 1
  • repeat
    a_n+1 = (a_n + b_n) / 2
    b_n+1 = √(a_nb_n)
    t_n+1 = t_n - p_n(a_n - a_n+1)²
    p_n+1 = 2p_n
  • pi is
    π ≈ (a_n+1 + b_n+1)² / 4t_n+1
• Leibniz Formula
  ∑[n=0→∞] (-1)ⁿ / 2n + 1 = π / 4
• Monte Carlo Method
  X = number of points are x² + y² ≤ 1
  N = number of total
  π ≈ 4X / N

Math.max() VS Array.prototype.reduce()

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Math.max() VS Array.prototype.reduce()
If you want to find out the largest number from array, you can use Math.max(...array). However this function can’t work if the array is so big. If you need to find out the largest number from big array, you should use array.reduce((a,b) => (a > b) ? a : b). This file compare the speed of Math.max() with the speed of Array.prototype.reduce().

Text Encrypter(TEST)

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link is here
Text Encrypter
Now, Salsa20 / ChaCha20 is available

• Salsa20
• ChaCha20