dubistdu

def pyramid(numbers)
  Array.new(numbers) { |i| [1] * (i + 1) }
end

dubistdu

function pyramid(n) {
  return Array(n).fill(1).map((elemeent, index) => Array(index + 1).fill(1));
}

dubistdu

def min_min_max(array)
  sorted = array.sort
  sorted_all=[*sorted.first..sorted.last]
  [sorted.first, (sorted_all-sorted).min, sorted.last]
end

dubistdu

def split_and_add(arr, n)
  n.times { arr.length.odd? ? arr.unshift(0) : arr 
            arr = arr.each_slice(arr.length/2).to_a.transpose.map { |x| x.sum }
          }
  arr
end

dubistdu

ruby

def perimeter(n)
  num = [0,1]
  i = 0
  until i == n do
    num << num[i] + num [i+1]
    i += 1
 end

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def validSolution(board)
  return false if board.flatten.include?(0)
  board.map {|a| a.uniq.count == 9}.include?(false) ? false : board
  square_of_3 = board.map { |a| a.each_slice(3).to_a }
  s1=square_of_3[0][0].zip(square_of_3[1][0],square_of_3[2][0])
  s2=square_of_3[0][1].zip(square_of_3[1][1],square_of_3[2][1])
  s3=square_of_3[0][2].zip(square_of_3[1][2],square_of_3[2][2])
  
  s4=square_of_3[3][0].zip(square_of_3[4][0],square_of_3[5][0])

dubistdu

*JS

const solution = (number) => {
  return (number < 1 ? 0 : [...Array(number).keys()].filter(num => num % 3 == 0 || num % 5 == 0).reduce((a,b) => a+b));
}

*ruby

dubistdu

Issue I had was terminal flashing and disappearing after removing Zsh while Terminal app was still running

Solution

• Before removing shell, I should have switched to bash using chsh -s /bin/bashsince I can't uninstall zsh as I was using zsh!

  • It should have been chsh -s /bin/bash
  • to swich back to bash temporarily
  • then uninstall / reinstall zsh
  • then chsh -s /usr/local/bin/zsh to switch back to zsh

• Since I didn't switch to bash first....

dubistdu

initialize git depository in the current directory

git init .

display the git remote/origin

cat .git/config

dubistdu

Ruby on Rails Cheatsheet (5.1)

Architecture

RVM

$ rvm list - show currently installed Rubies