worldofprasanna

Useful commands in vim-orgmode

Headers

      1. *, **, etc for creating headings, sub headings
      2. To continue headers, press <enter> in normal mode
      3. >>, << to convert sub headers to headers or vice versa
      4. <Tab> and <S-Tab> to fold headers
      5. zm, zr to close the whole list

worldofprasanna

Nerd Tree

• To show hidden files - I
• To toggle NerdTree - Ctrl + n

Vim Surround

• To surround a word with " - ysiw" (instead of iw - other text objects can be used like ip, iW )
• To change " to ' - cs"'

Zoom Vim

To toggle zoom in a pane - Ctrl + w, o

worldofprasanna

# to find a pid by port
lsof -n -i:$PORT | grep LISTEN

worldofprasanna

# pull & start the container
docker run busybox

# list all the images
docker images

# to remove all the images
docker rmi $(docker images -q)

# to remove the exited containers

worldofprasanna

class Proxy:
    def __init__(self, target_object):
        object.__setattr__(self, 'msg', OrderedDict())
        object.__setattr__(self, '_obj', target_object)

    def __getattr__(self, name):
        if name in self.msg:
            self.msg[name] += 1
        else:
            self.msg[name] = 1

worldofprasanna

# Java style of file handling
# Good example of sandwich code

filename='test.txt'
try:
	file = open(filename)
	print(file.readlines())
except Exception as e:
	print(e.args[0])
finally:

worldofprasanna

class Person {
  constructor(name){
    this.name = name;
  }
}
class Employee extends Person {
  
  constructor(id, name){
    super(name);
    this.id = id;

worldofprasanna

function printName(isFirstName){
  console.log(firstName); // Variables hoisted to the top
  console.log(lastName);
  
  if (isFirstName){
    var firstName = 'Prasanna';
  }else {
    var lastName = 'V'
  }
}

worldofprasanna

def array_to_hash(arr)
  hash_val = Hash.new
  arr.uniq.each {|n| hash_val[n] = arr.grep(n)}
  hash_val
end

# array_to_hash([1,2,3,2,1]) => {1=>[1, 1], 2=>[2, 2], 3=>[3]}