nickangtc

Notes learning Vim

Vim's modes enable Vim to have sane keyboard shortcuts instead of Cmd + Shift + whatever the hell next. In Normal mode, w jumps to the next word. In Visual mode, w highlights from current cursor position to the next word. In Insert mode, well w types out the w character.

j goes down instead of up - is this an arbitrary decision? I think not? My intuition says it's down instead of up, and k is up instead of down, because we go down much more often then go up, and it makes sense to let the stronger middle finger do that.

Navigating up with k skips to start of paragraph?? This surprised me. I also got annoyed quickly not being able to move up a line by hitting k or h (left), which you can do in a normal text processor. I'm sure there is a way to do this I don't know about... Yes! b (move back one word, which is like the reverse of w) does something like that.

Motions are commands that you use in Normal mode for navigating faster. _There must be a way to go back

nickangtc

// https://leetcode.com/problems/contains-duplicate/
// this solution beats 85% of other submissions in terms of runtime, 57% in terms of memory

/**
 * @param {number[]} nums
 * @return {boolean}
 */
var containsDuplicate = function(nums) {
    const memo = {};

nickangtc

// https://www.hackerrank.com/challenges/bear-and-steady-gene/problem

function steadyGene(gene) {
  const geneArray = gene.split("");
  const geneDict = geneArray.reduce(
    // O(n) time
    (dict, char) => {
      return {
        ...dict,
        [char]: dict[char] + 1,

nickangtc

// https://www.hackerrank.com/challenges/sherlock-and-valid-string/problem

function isValid(s) {
  const occurrences = {};

  for (let i = 0; i < s.length; i++) {
    const alphabet = s.charAt(i);
    occurrences[alphabet] = occurrences[alphabet]
      ? occurrences[alphabet] + 1
      : 1;

nickangtc

# scenario
# ========
# suppose we want functionality like so on any string:
# "racecar".palindrome?  #=> true
# 
# where should we could we add that functionality?

# in ruby, this is surprisingly possible:
class String
  def palindrome?

nickangtc

# exercise is from http://rubykoans.com/ - a great way to learn ruby!

#! my not so succinct but works solution
def triangle(a, b, c)
  validate_triangle(a, b, c)
  if a == b && b == c
    :equilateral
  elsif a != b && b != c && c != a
    :scalene
  else

nickangtc

array = ['foo']

# slicing
p array[0,1]  #=> ["foo"]
p array[1,1]  #=> [] - SURPRISE!?
p array[2,1]  #=> nil

# accessing 
# no surprises
p array[0]  #=> "foo"

nickangtc

# this example shows that in ruby you can
# define how an object is being compared
# to another object with a custom `==` method

class ProductItem
  attr_reader :name, :quantity

  def initialize(name, quantity)
    @name = name
    @quantity = quantity

nickangtc

// To use JavaScript in Apple Automator, select 'Run JavaScript' action
// copy-paste this code into that action
// no need to have any other action -> output is printed automatically

function run(input, parameters) {
	var now = new Date()
	var year = now.getFullYear()
	var month = now.getMonth() + 1
	var day = now.getDate()
	var hours = now.getHours()

nickangtc

Setting up github and bitbucket on the same computer (Windows)

Guide for Windows

mix3d asked for some help using this guide with windows so here we go. This was tested with Windows 10. Run all commands in Git Bash once it's installed.

Github will be the main account and bitbucket the secondary.

Git for Windows

• Download and install Git for Windows
  • In the installer, select everything but decide if you want a desktop icon (2nd step)