awssimplified · July 30, 2020 02:08 · Jul 30, 2020
diff --git a/NodeJS b/NodeJS
@@ -0,0 +1,71 @@
+NodeJS
+---
+Every file is a 'module'
+console.log(`Hi ${this.name}!`); <-- `` Templating
+Make sure to use the relative path when importing or node will think you are using the built in module
+
+
+exports.sayHello = function() {
+  console.log("Hello!");
+};
+
+^ is same as:
+module.exports = {
+  name: "Elie",
+  sayHello() {
+      console.log("Hello!");
+  }
+};
+
+Default module functions:
+module.exports = function() {
+  console.log("I am the entire module!");
+};
+
+allows you to do --> evenMoreHelpers()
+
+
+Destructuring Objects
+---
+Allows for quick shorthand extraction of fields from objects. Example below
+const obj = { first: 'Jane', last: 'Doe' };
+const {first: f, last: l} = obj;
+//f = 'Jane'; l = 'Doe'
+
+// {prop} is short for {prop: prop}
+const {first, last} = obj;
+    // first = 'Jane'; last = 'Doe'
+
+Destructuring Arrays
+---
+const iterable = ['a', 'b'];
+const [x, y] = iterable;
+    // x = 'a'; y = 'b'
+
+
+Event Loop
+---
+Stack which holds calls to be processed immediately
+Async calls get added to the event loop
+Event loop is a queue
+Once the stack is cleared, calls from the event loop start getting executed in order of insertion (FIFO)
+
+
+async.js
+---
+shorthand for promise.all() <-- waiting for multiple promises to resolve before executing the callback function
+
+
+Process Module
+---
+Used to invoke CMD arguments
+environment variables accessed using process.env
+process.argv gives you command line arguments
+process.env.ENV_VAR 
+
+
+
+
+Good read for event loop stuff
+---
+https://blog.risingstack.com/node-hero-async-programming-in-node-js/
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