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How To Install Different JDK Versions on MacOS with Homebrew

Keywords: Java, JDK (Java Development Kit), MacOS, Homebrew, Specific Version

This how-to guide covers how to install different versions of the JDK on MacOS with Homebrew.

Table of Contents

• Preface
• This Guide Favors OpenJDK

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function mapValues(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    result[key] = fn(obj[key], key);
    return result;
  }, {});
}

function pick(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    if (fn(obj[key])) {

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# My take on Mike's source_for method.
# (see http://pragmaticstudio.com/blog/2013/2/13/view-source-ruby-methods)
#
# (1) I named it 'src' rather than source_for (ok, I'm a lazy typer).
# (2) The edit function was broken out as a separate function.
# (3) The edit function is for emacs
# (4) If the method is not defined on the object, and the object 
#     is a class, then see if it is an instance method on the class.
#
# The fourth point allows my to say:

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You can terminate the sqlite3 program by typing your systems End-Of-File character (usually a Control-D).
Use the interrupt character (usually a Control-C) to stop a long-running SQL statement.

https://sqlite.org/cli.html

SQLite version 3.28.0 2019-04-15 14:49:49
Enter ".help" for usage hints.
sqlite> .help
.auth ON|OFF             Show authorizer callbacks
.backup ?DB? FILE        Backup DB (default "main") to FILE

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Help
  help               Show a list of commands or information about a specific command.

Context
  cd                 Move into a new context (object or scope).
  find-method        Recursively search for a method within a class/module or the current namespace.
  ls                 Show the list of vars and methods in the current scope.
  pry-backtrace      Show the backtrace for the pry session.
  raise-up           Raise an exception out of the current pry instance.
  reset              Reset the repl to a clean state.

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#!/usr/bin/env node

// COMMAND: ./use_npm_lock_versions.js ~/path/to/your/repo

const fs = require('fs');
const os = require('os');

function init() {
  const directory = parseDirectory(process.argv.slice(2)[0]);
  const [packageJson, newlineCharacter] = loadPackageJson(directory);

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// MIN_LEVEL = 5
// MAX_LEVEL = 15

// Light Switch | Brightnesses for given Bulb Capacity
// Dimmer Level | 5 Watt | 10 Watt | 20 Watt
// 5            | 0      | 0       | 0
// 15           | 5      | 10      | 20
// 10           | 2.5    | 5       | 10

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// Today, the bookstore owner has a store open for customers.length minutes.
// Every minute, some number of customers (customers[i]) enter the store, and all those customers leave after the end of that minute.
// On some minutes, the bookstore owner is grumpy.
// If the bookstore owner is grumpy on the i-th minute, grumpy[i] = 1, otherwise grumpy[i] = 0.
// When the bookstore owner is grumpy, the customers of that minute are not satisfied, otherwise they are satisfied.
// The bookstore owner knows a secret technique to keep themselves not grumpy for X minutes straight, but can only use it once.
// Return the maximum number of customers that can be satisfied throughout the day.

function maximizeCustomerSatisfaction(customers, grumpy, x) {
  const combinations = generateGrumpyCombinations(grumpy, x);

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// find two numbers whose sum equals the target_sum value

function create_digits(numbers) {
  const digits = {};
  for (let i = 0; i < numbers.length; i++) {
    digits[numbers[i]] = 1;
  }
  return digits;
}

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#!/usr/bin/env python3

# Given a 2D grid map of 1s (land) and 0s (water), count the number of islands.
# An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically.
# You may assume the grid itself is surrounded by water.
# https://www.geeksforgeeks.org/find-number-of-islands/
# https://www.geeksforgeeks.org/find-the-number-of-distinct-islands-in-a-2d-matrix/
# https://stackoverflow.com/questions/58767533/find-explicitly-islands-in-matrix
# http://www.huristic.co/blog/2016/10/14/finding-islands-in-an-adjacency-matrix