Rediscovering JavaScript

Chapter 1

Here are the solutions to the ​Exercises​, for the Chapter 1, ​JavaScript Gotchas​ chapter.

Exercise 1

return          //undefined
 2 * 3;

return 2        //6
  * 3;

return 2 * 3    //6
  ;

Exercise 2

//That's one strange comparison, but given the choices, choose ===
"2.0" / 2 * "2.0" === 2 / 2 * 2;

Exercise 3

'use strict';

const canVote = function(age) {
  if(age === 18) {
    return 'yay, start voting';
  }

  if(age > 17) {
    return "please vote";
  }

  return "no, can't vote";
};

console.log(canVote(12));      //no, can't vote
console.log(canVote("12"));    //no, can't vote
console.log(canVote(17));      //no, can't vote
console.log(canVote('@18'));   //no, can't vote
console.log(canVote(18)); ...