Exercise – Operators & Control Structures

by Diarmuid Dunne

JavaScript

/**
 * Exercise:
 *
 * Get to know your control structures
 *
 * Work in the console, or use "console.log()" to output to the console from the script
 *
 * these browser based functions can be used
 *     alert("Message string"); // will alert a message to the user
 *     var val = prompt("Question string?"); // will prompt the user for a value and return the value
 *     confirm("Message string"); // will ask the user to confirm with an ok, or cancel, returning a boolean
 */

// 1)
// Ask the user for a number (using prompt())
// Tell the user if it is even or odd (using alert())
// (hint: prompt() will always return a string)
var user = prompt("Please enter a number");

if(user / 2 !== 0)
{
    console.log("Even");
}

else
{
    console.log("Odd");
}
// 2)
// Ask the user how old they are (using prompt())
// If they are 70 or older, tell them they look great.
// If they are 18 or younger, tell them they should be in school.
// If they are between those ages, tell them to get a job.
var age = prompt("Enter an age");

if(age >= 70)
{
    console.log("You look great");
}
else if(age <= 18)
{
    console.log("You should be in school");
}
else if(age > 18 && age < 70)
{
    console.log("You got the job");
}
// 3) 
// We have an array of values
// Use a while() statement to go through each value of the array
// and add 1 to each number (but not strings)
// log the resulting array to the console

var myArray = [1,2,3,"Interlocutor", 4,5,6];
while(myArray
// 4)
// Make an array of people's names
// Use a for statement to go through each and combine
// them into a single string separated by commas
// Log the result to the console.
// ex result: "John, Sally, Nick"
  var nameArray = ["Diarmuid", "Dan", "Aoife", "Mary"];
 var nameConcat = [];
  for(var i = 0; i < myArray.length; i++)
{
    nameConcat = nameArray.concat(nameArray[i]);
}