Yusuke Hayashi yhay81

5 Steps to know about JavaScript Closure

This is what I think is easy way to understand what closure of JavaScript is.

Step 1. Declaration variables

When we use variables in programming, at first we declare it and then use it. So, what happens when I declare the variable which name is already declared?

	import sqlite3
	import discord

	client = discord.Client()


	@client.event
	async def on_ready():
	print('Logged in as')
	print(client.user.name)

	import discord


	client = discord.Client()


	@client.event
	async def on_ready():
	print('Logged in as')
	print(client.user.name)

	from matplotlib import pyplot as plt
	import numpy as np
	import pandas as pd
	from sympy import sieve

	def prime_doubles(upper):
	result = [0] * (2 * upper + 1)
	sieve.extend(upper)
	max_prime_index, _ = sieve.search(upper)
	for i in range(1, max_prime_index+1):

	let count = 0;
	const doOnlyOnce = function (){
	if(count==0){
	console.log("You do this for first time.");
	}else{
	console.log("You already have done this.");
	}
	count++;
	};

	from functools import wraps
	from time import time


	def timing(f):
	@wraps(f)
	def wrapper(args, *kwds):
	s = time()
	f(args, *kwds)
	return time() - s

	var SLACK_ACCESS_TOKEN = PropertiesService.getScriptProperties().getProperty('SLACK_ACCESS_TOKEN');
	var GIPHY_API_KEY = PropertiesService.getScriptProperties().getProperty('GIPHY_API_KEY');
	// var SPREAD_SHEET_ID = PropertiesService.getScriptProperties().getProperty('SPREAD_SHEAT_ID');

	var POST_MESSAGE_ENDPOINT = 'https://slack.com/api/chat.postMessage';
	var TEXTS = [
	'Do you like dogs?:dog:',
	'You said the word!:grinning:',
	'I hope you like this...:poodle:',
	'Dogs are cute!:dog2: Dogs are cute!:dog2:',

	class NaturalNumber:
	def __init__(self, p=None):
	self.predecessor = p

	def __eq__(self, x):
	if self.predecessor is None and x.predecessor is None:
	return True
	elif (self.predecessor is None and x.predecessor is not None) \
	or (self.predecessor is not None and x.predecessor is None):
	return False

	var token = 'xoxb-34...みたいなトークン';
	var slack = GASlacker.methods(token);

	function doPost(e){
	var event = JSON.parse(e.postData.contents).event;
	if(event.text.match(/hello/)){
	var text = "Hello," + event.message.username;
	slack.chat.postMessage(event.channel, text);
	}
	}