trevor-atlas

   🔥
   ┏🔥🔥
   ┃┃╱╲ in
   ┃╱🔥╲ this
   ╱ ╭╮ ╲ house
   ▔▏┗┛▕▔ we🔥🔥
   ╱▔▔🔥▔▔▔▔▔▔▔╲ 
 🔥TEST IN PRODUCTION
 ╱   ┏┳┓╭🔥┏┳┓   ╲ 
 ▔▏  ┗┻┛┃┃ ┗┻┛🔥▕▔

trevor-atlas

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣠⣶⡾⠏⠉⠙⠳⢦⡀⠀⠀⠀⢠⠞⠉⠙⠲⡀⠀
⠀⠀⠀⣴⠿⠏⠀⠀⠀⠀⠀⠀⢳⡀⠀⡏⠀⠀⠀⠀⠀⢷
⠀⠀⢠⣟⣋⡀⢀⣀⣀⡀⠀⣀⡀⣧⠀⢸⠀Ship ⡇
⠀⠀⢸⣯⡭⠁⠸⣛⣟⠆⡴⣻⡲⣿⠀⣸⠀it!  ⡇
⠀⠀⣟⣿⡭⠀⠀⠀⠀⠀⢱⠀⠀⣿⠀⢹⠀⠀⠀⠀⠀ ⡇
⠀⠀⠙⢿⣯⠄⠀⠀⠀⢀⡀⠀⠀⡿⠀⠀⡇⠀⠀⠀⠀⡼
⠀⠀⠀⠀⠹⣶⠆⠀⠀⠀⠀⠀⡴⠃⠀⠀⠘⠤⣄⣠⠞⠀
⠀⠀⠀⠀⠀⢸⣷⡦⢤⡤⢤⣞⣁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⢀⣤⣴⣿⣏⠁⠀⠀⠸⣏⢯⣷⣖⣦⡀⠀⠀⠀⠀⠀⠀

trevor-atlas

░░░░░░░░░░░░▄█▀█▀▀▀▀▀▀▀▀▄▄░░░░░░░░
░░░░░░░░░░▄██▀░█░░░░░░░░░░▀▀▄▄░░░░
░░░░░░░░░░███▀█▀█▄▄▄▄▄▄▄▒▒▒▄███░░░
░░░░░░░░▄██░░░░█░░░░░░░░▀▀▀▀▀▀█░░░
░░░░░░▄███░░░░░░█░░░░░░░░░░░░░░░░░
░░░░░█████▄░░░░░█░░░░░░░░░░░░░░░░░
░░░░████████▄▄░█░░░░A░NEW░░░░░░░░░
░░░████████████░░░░░RELEASE░░░░░░░
░░░▀██████████░░░░░░░░HAS░░░░░░░░░
░░░░██▒▀█▒▀█▀░░░░░░░░░░ARRIVED░░░░

trevor-atlas

▄▄▄▄▄▄▄▄▄
░▄███████▀▀▀▀▀▀███████▄
░▐████▀▒ Ship ▒▒▒▒▀██████▄
░███▀▒▒▒▒  it!  ▒▒▒▒▒▀█████
░▐██▒▒▒▒▒▒ ~~~~ ▒▒▒▒▒▒████▌
░▐█▌▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒████▌
░░█▒▄▀▀▀▀▀▄▒▒▄▀▀▀▀▀▄▒▐███▌
░░░▐░░░▄▄░░▌▐░░░▄▄░░▌▐███▌
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░▌▒▀▄░░░░▄▀▒▒▀▄░░░▄▀▒▒▄▀▒▌

trevor-atlas

──────▄▌▐▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▌ 
───▄▄ █ █  Ship it! ~~~~~~~~~~~
███████▌█▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▌ 
▀(@)▀▀▀▀▀▀▀(@)(@)▀▀▀▀▀▀▀▀▀▀▀▀▀(@)▀

trevor-atlas

             __---~~~~--__                      __--~~~~---__
            `\---~~~~~~~~\\                    //~~~~~~~~---/'  
              \/~~~~~~~~~\||                  ||/~~~~~~~~~\/ 
                          `\\                //'
                            `\\            //'
                              ||          ||      Hey Doc!
                    ______--~~~~~~~~~~~~~~~~~~--______              
               ___ // _-~                        ~-_ \\ ___  
              `\__)\/~                              ~\/(__/'          
               _--`-___                            ___-'--_        

trevor-atlas

In JavaScript, undefined is nothing but a global variable name without a default value. Therefore, its primitive value is undefined. You can change the value of undefined:

const a = {};
a.b === undefined; // true because property b is not set
undefined = 42;
a.b === undefined; // false

Due to the mutability of undefined, it is generally a better idea to check for undefined-ness through typeof or void:

trevor-atlas

/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} root
 * @return {boolean}

trevor-atlas

/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} node
 * @return {boolean}

trevor-atlas

// get the current year as an int, E.G: 2018
Calendar.getInstance().get(Calendar.YEAR);

/* get date as iso 8601 string
 * public static Instant now()
 * Obtains the current instant from the system clock.
 * This will query the system UTC clock to obtain the current instant.
 * 
 * public String toString()
 * A string representation of this instant using ISO-8601 representation.