jittdev

/* In C++, an instance of a variable can be stored directly in memory, accessed by pointer, or accessed by reference:
Cube c;
Cube *ptr = &c;
Cube &r = c; */

// A reference variable has no memory/size; it is only an alias to another variable.

// Storage by pointer
Cube *c;    // Pointer to a Cube in memory
int *i;     // Pointer to an integer in memory

jittdev

# submit the form as an Ajax request instead of regular form submission.
# this is called an XHR request
# then add Javascript to update only part of the page

# move the view block to a partial

_result.html.erb

<div class="results-block">
    <%= render 'layouts/messages' %>   #when using ajax, must redefine error flash path

jittdev

grant all privileges on database.* to username

jittdev

sudo find . -inum 79707947 -exec rm -i {} \;

where 79707949 is InodeNumber that you found by using ls -il

jittdev

# when creating new rails app add -T to skip minitest
rails new app_name -T

#in Gemfile under group :test do
gem 'rspec-rails'

# should also have gem 'capybara', gem 'selenium-webdriver', gem 'webdrivers'

#then run
bundle install

jittdev

# https://docs.python.org/3/library/array.html#module-array

from array import array

#arrays take up less memory than lists and perform more quickly

# array(type_code, [])

arr = array('i', [1,2,3])   #i = signed integer type_code

jittdev

for i,char in enumerate('Helllooo'):
  print(i, char)

# if you need the index counter of what you're iterating through

for i,char in enumerate(list(range(10))):
  print(i, char)
  if char == 5:
    print(f'index of 50 is: {i}')
    

jittdev

#Decorator
from time import time   #built in module
def performance(fn):
  def wrapper(*args, **kwargs):
    t1 = time()
    result = fn(*args, **kwargs)
    t2 = time()
    print(f'took {t2-t1} s')
    return result
  return wrapper

jittdev

class X:pass
class Y:pass
class Z:pass
class A(X,Y):pass
class B(Y,Z):pass
class M(B,A,Z):pass  #B is passed before A

print(M.__mro__)

# or can use this syntax for mro:

jittdev

import axios from 'axios';

export function listTasks () {
    return axios.get('/jasks.json').then(function(response){
        return response.data;
    })
}

listTasks().then(function(response){
    console.log(response);