Gagan Srai gsrai

How to setup a python environment

python3 -m venv venv
source venv/bin/activate

pip install ...

pip freeze > requirements.txt

Are decorators just higher order functions?

a HOF is just a function which takes a function as an argument. Alternatively, it’s a function which returns a new function. In both cases it’s a higher-order function. There is another case when you define a function which returns a function. This could be a middleware in Clojure’s Ring or a Python decorator:

def my_decorator(func):
    def wrapper():
        print("Something is happening before the function is called.")
        func()

JS vs Go vs C fib

Running on MacBook Air (M1, 2020) with 16 GB of RAM.

gcc fib.c -O2

n = 40

result = 102334155

	def max_depth(s):
	arr = [0]
	for char in s:
	if char == "(":
	arr.append(arr[-1] + 1)
	if char == ")":
	arr.append(arr[-1] - 1)
	return max(arr)

	s = "( ((X)) (((Y))) )"

	(ns roman-numeral-converter.core
	(:require [clojure.test :refer [deftest is run-tests]]
	[clojure.string :refer [replace]]))

	(def numeral-mapping {1 "I" 5 "V" 10 "X" 50 "L" 100 "C" 500 "D" 1000 "M"})

	(defn arabic-to-roman [n]
	(loop [[x & xs :as all] (-> numeral-mapping keys sort reverse)
	romanised ""
	num n]

	(defn binary-search [n coll]
	(loop [upper (dec (count coll))
	lower 0]
	(let [mid (int (Math/ceil (/ (+ upper lower) 2)))]
	(if (= upper lower)
	nil
	(cond (= n (nth coll mid)) mid
	(< n (nth coll mid)) (recur (dec mid) lower)
	(>= n (nth coll mid)) (recur upper mid))))))

	class Timer {
	startTime
	endTime

	constructor() {
	this.startTime = Date.now();
	}

	finish() {
	this.endTime = Date.now();

	function isAnagram(s: string, t: string): boolean {
	if (s.length !== t.length) return false

	let counter = new Array(26).fill(0);
	for (let i = 0; i < s.length; i++) {
	counter[s.charCodeAt(i) - 'a'.charCodeAt(0)]++
	counter[t.charCodeAt(i) - 'a'.charCodeAt(0)]--
	}
	return !counter.some(i => i < 0)
	};

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<title>404 Not Found - React + Babel + Tailwind HTML only</title>
	<script src="https://unpkg.com/react@17/umd/react.development.js"></script>
	<script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>

	<!-- Don't use this in production: -->

	package main

	import (
	"fmt"
	"time"
	)

	/*
	* There once was a wise servant who saved the life of a prince. The king promised to pay whatever the servant could dream up.
	* Knowing that the king loved chess, the servant told the king he would like to have grains of wheat.