Control FlowControl flow studies// source https://jsbin.com/xitune

jsbin.xitune.js

// -----Control Flow----- //

/* If statements are used in Javascript to make decisions--whether to execute a following
code or not. An if statement first evaluates the boolean within parentheses and then executes
the code within curly braces if the boolean was true: */

"use strict";

if (typeof "Is this a string?" === "string") {
  console.log("Yup, it was a string");
}

/* If the boolean resolves to false, the code is simply passed over. Further keywords can 
be used along with the if keyword to create chains of if else statements: */

var arr = [];

if (typeof arr === "string") {
  console.log("I will be skipped :( ");
} else if (typeof arr === "number") {
  console.log("I'm gonna be skipped, too! :((( ");
} else if (Array.isArray(arr)) {
  console.log("Finally!");
}

/* lastly, a final else keyword can conclude the chain, providing a default result if none of
the provided statements resolve to true. */

arr = {};

if (typeof arr === "string") {
  console.log("I will be skipped ☹ ");
} else if (typeof arr === "number") {
  console.log("I'm gonna be skipped, too! ☹☹☹ ");
} else if (Array.isArray(arr)) {
  console.log("Finally!");
} else {
  console.log("You lied to me! I'll never forgive you.");
}