crabmusket

PHP exceptions and errors

In PHP, Exceptions can be caught:

try {
    throw new \DomainException('input out of bounds');
} catch (\Exception $e) {
    echo "got exception\n";
} finally {

crabmusket

title_case.ts

Usage example:

import { titleCase } from "https://gist.githubusercontent.com/crabmusket/cd10f732e847afd023a00f6a45bd0d72/raw/558463e1c2a5aa910915a21396b105cefd1254d9/title_case.ts";

console.log(titleCase("deno is AWESOME"));
console.log(titleCase("words-can contain_punctuation"));
console.log(titleCase(" spacing is preserved"));

crabmusket

FROM ubuntu:16.04

RUN apt-get update && apt-get install \
	build-essential \
	clang-3.8 \
	curl \
	git \
	libxml2 \
	python-dev \
	-y

crabmusket

Deno micro modules

Each of these modules is a single file consisting of no more than a page or two of code, which provide some useful 'generic' feature. These modules could be copied as-is into any TypeScript project, but they're designed to work with Deno. Deno's URL loading makes it very easy to import them.

• semaphore.ts, an async Semaphore class
• json.ts, a JsonValue type and utility functions
• title_case.ts, convert strings to 'Title Case'

crabmusket

semaphore.ts

An asynchronous semaphore utility class meant to work with Deno. You can use it to implement rate-limiting and other concurrency patterns.

Usage example:

import { Semaphore } from "https://gist.githubusercontent.com/crabmusket/681b4f81ed05716f8dd10ac88d1d960b/raw/5e7c18013e896425d1048324f8668932f23437df/semaphore.ts";

crabmusket

/** For the spec of the JSON type, see http://json.org */
export type JsonValue = JsonObject | JsonArray | number | string | boolean | null;

/** JSON objects can have any string key. */
export interface JsonObject {[key: string]: JsonValue};

/** For the explanation of this type, see https://github.com/Microsoft/TypeScript/issues/3496#issuecomment-128553540 */
export interface JsonArray extends Array<JsonValue> {};

/** Narrow the type of a JsonValue to check if it's an object. */

crabmusket

deno_env_file.ts

Use this snippet to parse, modify and render environment files.

import { EnvFile } from "https://gist.githubusercontent.com/crabmusket/e10effe4800691bb15543ff264518e76/raw/deno_env_file.ts";

let content = `
KEY=value
SOMETHING_ELSE=cool

crabmusket

module Alphabet (
    Alphabet,
    encodeWithAlphabet,
    decodeFromAlphabet
 ) where

import Prelude
import Data.List(elemIndex, mapAccumR)
import Data.Maybe(fromMaybe)

crabmusket

# https://blog.notryan.com/server.py
# https://www.reddit.com/r/programming/comments/gdxh3w/http_blog_server_100_lines_of_c_in_a_closet/fpkqvqw/

import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(("0.0.0.0", 8080))
sock.listen(1)

while True:

crabmusket

JSON-RPC pipeline batches

Typical RPC implementation

Say we want to implement an RPC service for basic maths operations. For example, let's calculate the value of ln(e^2). This calculation has several steps in our maths API:

1. Get the value of e
2. Square e